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24/7 Real Media
Ads: (CPM, CPC) display ads
Revenue split: 50/50
Default ads: no
To apply: Fill out a short contact form and wait for an account manager to contact you
Our experience: The account managers are really responsive, but their interface is horrible. We ended up with about $0.30 CPM, which we might have been able to raise but I hated their interface too much to try (very very difficult to go through and decline unappealing ads, which they have a lot of).
Our score: below average (1). not recommended

AdBrite
Ads: (CPM, CPC) display and text ads, inline text links on content, photos, and videos
Revenue split: undisclosed
Default ads: yes
To apply: Fill out the form and get started immediately
Our experience: Ads aren't great quality, but need more time to see its long term performance. Since you set your own rate and can provide a default ad, there's no wasted impressions to try.
Our score: average (2). recommended

AdDynamyx
Ads: (CPM, CPC) display ads
Revenue split: undisclosed
Default ads: yes -- must contact account manager to set up
Our experience: They denied us because we are a blog

AdEngage
Ads: (flat weekly rate, CPC) text ads w/accompanying image option
Revenue split: 75/25
Default ads: no
To apply: Fill out form and wait for site approval
Our experience: Did not use them extensively enough to see performance, but it looks like a risk free option if you have unused space that can fit some text link ads. The ad space is completely customizable (even make the font size extra small).
Our score: average (2). recommended

Adfish
Ads: (CPA) display ads, text links, and email campaigns
Revenue split: undisclosed (payout rate per lead)
Default ads: no
To apply: Fill out form and wait to be approved
Our experience: They're a small affiliate network with limited campaigns, but with a fairly basic system that is very user friendly, it's a good place for a beginner to learn the ropes of affiliate marketing.
Our score: average (2). recommended

Adify
Ads: (CPM, CPC, flat rate) display ads
Revenue split: varies
Default ads: yes
To apply: Pick one or more of their networks to join
Our experience: It's a confusing system because of the different networks they run. You need to be a part of one of their networks (with their own ad sales team), and then Adify's sales team might sell some ads for you as well. The performance is based on how well the individual networks do. We joined because we were invited by networks that were not listed on their network page, so our approval process went smoother. Adify is actually more of a manager than an ad network.
Our score: average (2). recommended

Adgitize : easy one and a good CPM ads

adknowledge offers targeted CPC graphic and text ads, as well as email and search campaigns. They use behavioral targeting to serve the most relevant ads, and boast having over 50,000 advertisers vying for your ad space.

AdOn Network offers CPM (they call it CPV--cost per view--for some reason) text and graphic ads. You can't sign up online--you will need to shoot them an email and a representative will contact you.

ad pepper can provide exclusive or non-exclusive representation for your ad inventory. They offer many types of CPM ads including graphic, contextual, and integrated text links.

ADSDAQ runs text and graphical CPM ads and allows you to set your CPM rate. They also use performance stats to serve the highest performing ads first, which benefits both the advertiser and publisher.

Adsmart serves the U.S. and U.K. extensively, requiring a minimum of either 70% USA traffic or 70% UK traffic, and 100,000 monthly page views. They offer CPM and CPC campaigns and pays out 55% of net sales revenue.

adsonar claims to "raise the relevancy bar" by delivery content-targeted ads better than other networks. Advertisers bid for placement and run if it meets your minimum bid requirement.

Adtegrity
Ads: (CPM, CPC) display ads
Revenue split: 60/40
Default ads: no
To apply: Fill out their form and wait for approval
Our experience: They claim 100% sellout of your inventory (no defaults or PSA) although much of the fill could be CPC ads. You get an account manager that is supposed to hand pick the ads on your site, but our account manager didn't seem to have very high quality standards. We didn't use them for very long after seeing the ads that were showing (which we had no control over). For a network with such high requirements for their publishers (500,000 page views/month), they don't follow through with high performance rates.
Our score: below average (1). not recommended

AdToll allows you to set your own price and pays 75% commission. They offer CPM and CPC ads in all the standard ad units, including Video Ads as well as a new ad unit called a Peel Away Ad where an ad is hidden under your page and is activated upon a mouseover by a user.

Advertising.com claims to be the largest online advertising network. They offer rev-share, CPA, and CPM pricing options that you can set the minimum for. You need a healthy two million impressions per month to join (their affiliate program does not have a minimum traffic requirement).

Amazon Associates is one of the most popular affiliate programs because it is easy to sign up and implement. Amazon offers many different types of ad units to fit your needs (automated ads or publisher generated links for specific products). If a visitor clicks on your link and actually purchases something from Amazon, you get a percentage of the sale.

AzoogleAds is a large affiliate network serving CPA ads from Fortune 1000 and Fortune 500 companies. They offer solutions for search, web and email campaigns.

Bannerconnect specializes in both US and EU markets and offer 100% fill rate for worldwide traffic. If you get substantial traffic around the world, they can provide the inventory for those page views. They offer CPM, CPC and CPA ads.

BannerSpace offers different levels of representation depending on your traffic and exclusivity. They can take over your entire sales department by putting a team on your site and managing your entire inventory. They can also work with your existing sales team to fill remnant inventory. For small to mid-sized sites (less than 20,000 daily page views), they work like most ad networks, supplying CPM/CPC ads to fill up your inventory.

BardozoMedia provides "targeted and optimized" graphic ads to publishers at at a net share of 70%. They cover the U.S., Canada, and Europe.

BidVertiser serves CPC text ads on your site as well as your feed. Rates are determined by advertisers who bid on your ad space. Terrible rates and terrible advertisers

BlogAds specializes in selling advertisement on blogs. Their ad unit combines images with mult-linked text. You can set your own prices (they take 30%) and write your own blog description to sell your ad space. You need to be invited by a current blog member in order to join.

Blue FN is an ad network that features financial services advertisers. All their ads are either CPC or CPA and your site must contain finance-related content.

BlueLithium uses behavioral targeting to "buy audiences, not inventory" to delivery big results for both advertiser and publisher. They offer CPM, CPC, CPL and CPA ads which include rich media formats as well.

Bravenet Media supports on-site advertising programs, email sponsorships, co-registration forms, and other specialty media programs. They only accepts sites with a minimum of 1 million ad views per month.

Burst Media has two different programs in their network. Burst Network focuses on Target Advertising sold on a CPM basis. Non-targeted Advertising campaigns are sold at lower CPMs and include CPC ads to fill up inventory. They keep 50% of the ad revenue but offer better rates for publishers who agree to one year or three years exclusivity. Burst Direct is the other program they offer that run performance-driven campaigns. They take a much smaller cut (35%), but the revenue potential is probably more uncertain. You must have a private policy page on your site. And only use IE to apply -- their application form doesn't seem to work on FireFox.

BuzzLogic

Chitika offers one-of-a-kind ad products that provides powerful and integrated promotions. They are all CPA ads for products, so is a good network to use if your site is related to shopping or has a good tie in with products. Chitika offers a wide variety of categories and ad units to choose from, so you have more control over the type of products to feature instead of depending on keywords to be picked up by their ad server.

ClickBank is an affiliate network with over 10,000 products available. Commissions range from 1% to 75% with a minimum commission for a single sale at $0.25 and the maximum at $100.

Clickbooth is an affiliate network that has been around for more than a few years. They test all their offers to ensure income potential and gives weekly payouts to top publishers. They also donate a portion of their revenue to charitable causes.

Clicksor offers both inline text ads as well as targeted text and graphic ads in various sizes. You can choose from CPC, CPM, or CPV ads and earn up to 60% of the ad revenue share. Their system will evaluate the content on your page and serve relevant, contextual ads.

clixGalore is an affiliate network offering text and graphic ads to promote merchants and earn commission.

Commission Junction
Ads: (CPA) display ads and text links
Revenue split: undisclosed (payout per lead)
Default ads: no
Our experience: CJ is a very popular affiliate network with a huge selection of advertisers. Plenty of publishers have been able to make money from CJ, but we never did. Because of their huge selection of advertisers, it may be daunting at first to go through and find ones appropriate for your site. Sometimes you need to get approval from an advertiser direclty before being able to show their ads.
Our score: average (2). recommended

Commission Soup is another affiliate network that offers pay per performance programs exclusively. Similar to Commission Junction, you need to apply to each advertiser's program separately. You can view their client list here.

COPEAC offers affiliates top payouts and quick payments using an optimization system that drives traffic to the strongest performing landing pages, increasing conversion rates. Their team will also work with you to create designs that optimize exposure for immediate results.

Copernic Media Solutions supports CPC, CPM, and CPA campaigns and serve targeted ads based on your category. They also offer search listings and branded services for sites that use search tools.

CPA Empire focuses on providing a high level of affiliate support to help your campaigns do well. Their initiatives include banner ads, text ads, search marketing, and email promotions. They have over 700 live campaigns.

CrispAds caters to blogs and serves contextual graphic and text ads based on the keywords and advertisers you select. Most are CPC ads unless ads are purchased as a monthly sponsorship at the rate you set. Unlike most networks that have a minimum payout of $25-$100, their minimum is set at a low $5.

CX Digital Media is an affiliate network offering CPA campaigns from Fortune 1000 clients. Benefits include twice monthly payments and a rewards program where affiliates can claim prizes based on the money earned. They require 5,000 impressions per month to join.

Direct Media Exchange auctions impressions to the highest-paying ad network. CPM campaigns are served (with CPC/CPA ads optional) and their marketplace includes many networks such as Adtegrity, BannerConnect, CPX Interactive, Kitara Media, Revenue Science, Rydium, and Vizi Direct. You can tap in to all of these ad networks at the same time and get the highest rate among them.

FeedBurner is a popular network that offers advertising for your feed as well as your site. Their site ads include Google Adsense to get the most inventory fill for your space. Even though FeedBurner does not have a minimum feed count to serve ads, advertisers are unlikely to purchase feeds with low numbers.

Flux Advertising is an affiliate network running performance based ads. An account manager will be assigned to you to help guide you to the promotions and offers best suited for your site. This is optimal for those who need more personal attention to get started. They also offer a bonus rewards program where you can claim prizes based on your earnings.

Google Adsense is the most popular and widely used contextual advertising network. They serve CPC ads (image or text) based on the content on your page. Advertisers bid on keywords so the CPC rate varies from one ad to another.

HerAgency does not work like a typical ad network where ads are dispersed to hundreds of sites at any given time with little discretion. They make buys and create campaigns for sites individually as well as a package of quality women-oriented sites. Their cut ranges from 35-50%, depending on your site's traffic, and the requirement to join is 200,000 monthly page views (and of course, a primarily female audience).

IndustryBrains serves CPC contextual text and graphical ads with rates determined by bids advertisers place for specific categories. Unsold inventory can be used for rich media graphical ads that are paid when users view an ad (the ads are interactive).

Juicy ads : These are 18+ ads but very effective to attract visitors

Kitara Media represent quality sites, securing high CPM rates for your ad inventory. They will also provide guidance in implementing traffic strategies and revenue solutions.

Kontera serves inline text ads, using your own text as ad units. Keywords are automatically turned into links to relevant ads. Kontera provides more control and better usability than some of the other networks that offer inline text ads.

LeaderMarkets is an affiliate network that runs email and search CPA campaigns. They guarantee the highest payouts by matching any offer at a higher rate you find elsewhere.

LinkConnector is an affiliate network that offers additional programs besides the standard pay per lead or pay per sale campaigns. They also offer programs that include pay per call (if a user places a call to the merchant) as well as pay per go (rewards for specific outbound clicks on merchant's site as well).

LinkShare is an affiliate network that offers a robust tracking technology that is not cookie based, ensuring accurate and complete tracking. They also provide an array of publisher tools for better usability and earnings analysis.

LinkWorth offers a variety of ways to monetize your site, including text link ads, inline text ads, hosted content (an advertiser writes part of your content), and paid blog posts. They also offer services for publishers to drive traffic, such as directory listings and press release submissions.

MaxBounty is an affiliate network promoting an "open advertising network" which allows affiliates direct communication with the merchants.

Mirago is a leading network in Europe, so if you have a lot of European traffic, they can monetize your inventory with content-targeted links.

MIVA exclusively serves CPC targeted text and inline text ads. You can select keywords that trigger ads when their contextual matching technology does not find an ad to serve that matches your content.

OrangeFeed provides ads for your feed including several ad formats not available on other feed advertising networks. Not only can you display a text ad at the bottom of your items, you can also have inline ads (max 1 link per article) as well as headline ads.

Pepperjam Network provides publishers with an ad widget which allows customized contextual ads from one or multiple advertisers at the same time. You can mix ads from any merchant partner to make the most out of your ad space.

PerformancingAds provide a marketplace for publishers to list 125x125 ad units for sale. It has an easy setup process.

Pheedo delivers ads in your feed. Even if you are using another feed management service, Pheedo can still serve their ads through it too, allowing better inventory fill for your feed ad space.

Pog ads : Its an adsense alternative. Low pay but effective in pog ads

PrimaryAds is an affiliate network that provides dedicated support and selective offer acceptance. Each offer is "tested" before they are made available through the network. They also offer flexible payment terms (checks can be sent weekly, bi-weekly, or monthly).

Project Wonderful
Ads: (flat rate) display and text ads
Revenue split: 75/25
Default ads: no
To apply: Fill out form and wait for approval (after your account is approved, you still need to submit each site for approval)
Our experience: Pretty low value for the space -- most bids were about $1 per day
Our score: below average (1). not recommended

Q-Ads
Ads: text ads (unclear whether it's CPM/CPC)
Revenue split: undisclosed
Default ads: no
To apply: Fill out form and start immediately
Our experience: Q-Ads have to be used in conjunction with Qumana, a blog editor, which is not something we use

RealTechNetwork gives 70% revenue share and guarantees 100% sell-through of your traffic. They offer many different ad units and use behavioral and contextual targeting to serve the most relevant ads. They require 25,000 impressions per month to join.

RevenuePILOT is a pay per click search affiliate network that gives 60% for each click through revenue generated through a search on your site. You can choose keywords to decide which type of listings to show. CPC rate varies with keywords and you can check current prices on to see what keywords are worth.

Revenue Science offers innovative solutions to publishers who are interested in delivering targeted ads and having flexibility with their inventory sales. They have several publishing tools that allows different levels of targeting and includes a Targeting Marketplace to sell inventory to other resellers as well.

Revver attaches ads to videos uploaded to their site. As the creator of the video, you can then earn revenue from those ads by showing it on your site or sharing it with others. You can also share other people's videos too, earning revenue for both you and the creator.

Rydium runs content-relevant ads, offering a variety of creatives and targeting features. They require a minimum of 1 million page views per month.

Scratch//Back is an innovative system that allows users to "tip" you and in return you "give back" links or images. Users who tip are allowed to display a text link or image with a custom message on mouseover. You can set your own rates and listing preferences and remove any listing with no refund to the tipper.

Text-Link-Ads sell text links on your pages. You allocate a space on your page for their links, submit which pages you want to sell on, and they'll put your space in their marketplace. They take 50% of the revenue and rates are based on your PR, which has to do with how many sites link to your page. The more popular the page (based on links), the higher the rate for an ad on the page. Text-Link-Ads also offer paid text links in your feeds, too (Feedvertising option). You can use the space to sell text links through Text-Link-Ads (the same way they sell text links for your site) or put your own ads in there. The Feedvertising option is only available to Wordpress users.

ValueClick Media
Ads: (CPM, CPC) display ads
Revenue split: undisclosed (but their commission is already taken out of the listed rates)
Default ads: yes
Our experience: ValueClick has a wide variety of ads ranging in quality and rate. You can get a decent net CPM, but constant monitoring is required to maintain a desired quality and CPM level. But their interface is user friendly, so the daily process isn't terribly painful, but still time consuming. Additionally, the first time you activate an ad unit, be prepared to get carpal tunnel as you go through and remove the check mark from a tiny box for maybe a hundred ads.
Our score: average (2). recommended

Vizi Direct offers 100% fill rate (including international traffic) with no default or house ads and runs only impression based campaigns.

The reviews above are based on our experience using these networks on sites within our Killer Aces Media network.
Ads: Display ads are standard graphic ads, usually in leaderboard, rectangle, and skyscraper units. Text ads look like Google Adsense, where it has a text link with short description. Text links are usually just a one line text link, without the extra description below.
Revenue split: Most of the time, the listed rate is already the net rate that you take home. The reason to look at the revenue split is it may give one network a let up in terms of your overall CPM.
Default ads: This is the ability to insert another network's ad code if a minimum CPM isn't met, or paid ads aren't available.
Our score: We rate each network either below average (1), average (2), or above average (3). Below average marks means the earnings were lower than average and/or the user interface was poor. An average rating means either the earnings were acceptable or could work well for certain sites. This means that while we didn't earn very much through the network, we can see how other sites might fare better. And above average rating means that it's widely used and offers at least industry standard, if not higher, rates.
How to choose: look at their "advertiser" page, not just the "publisher" page. Sometimes you'll find more information there (whether they're exclusively CPA as well as a listing of other publishers in their network).