Following my last post where I questioned the value of building an ad engine for my own purposes, I began doing a little research on the different ad networks/services to figure out what it would take to support the more well known services. I knew of a few of them because of past experience in the arena (Adsense, Commission Junction, DoubleClick, Kanoodle, etc.), but I wasn't ready for what I discovered. Beyond the top couple of companies the market is huge and relatively unknown, at least to the layperson like myself.
Below is a list of all the players that I have found over the last couple of hours. I cannot vouch for any of them at this point, but it would make an interesting exercise to try all of them and report on the experience and level of success with each one. Some of them seem to be more preferred than others based on their prevalence on blogs in general and professional bloggers' sites specifically. Google Adsense seems to be the king of the hill, while others like Azoogle Ads (AzAds), Kanoodle, and a newcomer - AuctionAds - fight for a distant second, third, fourth ... place. I found most of them from following links from high profile blog sites, but I also learned about some from Darren Rowse's Problogger.net post, "How Bloggers Make Money from Blogs".
This list includes pure Ad Network services along the lines of Adsense as well as well-know affiliates like Amazon and Monster. Additionally, some of the services listed are only in beta at the time of their listing here and may not be open to the public (like Microsoft's AdCenter, Feedburner, and YPN).
Advertising Networks / Services
Adtegrity (added 4/16/07)
Advertising.com (added 3/17/07)
Affiliate Power Ads
AVN Ads: Adult Ads
AvantLink (added 3/27/07) - seems to have some nice features that others do not
Blue Lithium (added 4/16/07)
Burst Media (added 4/16/07)
Casale Media (added 4/16/07)
ClickXchange (added 3/27/07)
ClixGalore (added 3/27/07)
DarkBlue (added 3/27/07)
The Deck (added 4/16/07)
FeedBurner - FeedBurner Ads for Blogs and Feeds
Federated Media (added 4/1/07)
GoldenCAN - (added 4/18/07) affiliate data feed, coupon, and search integration solution
Google AdSense - Read my My Review
Gorilla Nation (added 4/16/07)
Hydra Network (added 5/2/2007)
Kolimbo (added 3/27/07)
Kontera ContentLink (added 4/5/07)
LinkConnector (added 3/27/07)
LinkShare.com - (added 3/9/07)
LinkWorth's LinkWords (added 3/8/07)
Lake Quincy Media (added 3/27/07)
NeverBlueAds (added 3/27/07)
Performics ConnectCommerce (Added 3/23/2007)
ShareASale (added 3/27/07)
Share Results (added 3/27/2007)
Team Link Network (added 4/13/07)
Text Link Ads
Vantageous (added 4/16/07)
Vibrant Media - intelliTXT
XY7.com (added 3/27/07)
Yahoo Publisher Network
CareerBuilder - email for into
Bravisa - similar to Chitika Shoplincs and Amazon's aStore
HiddenNetwork - Jobs (added 3/9/07)
HubPages (added 6/9/08)
Monster AFFILIATE PROGRAM
Reactee T-Shirts (added 1/26/08)
RegNow (added 4/10/07)
Shopzilla (Added 3/31/07)
Blogsvertise (added 4/1/07) - a mix between sponsored reviews and traditional banner ad placement
CREAMaid (added 4/3/07) - appears to be similar to sponsored reviews
inBLOGads (added 4/3/07) - appears to be a mix between links and sponsored reviews
Pay Per Post (added 4/1/07) - similar to sponsored reviews.
SponsoredReviews - get paid to write reviews on your blog (added 3/14/07)
ReviewMe (added 4/2/07) - similar to sponsored reviews and the others.
BlogBurst - (added 4/5/07) get your site added to major media sites, top blog sites earn rewards.
Eurekster's Swicki - (added 4/18/07)
AGLOCO - (added 5/2/2007) get paid to use the internet
MPire's Shopping Widgets (added 5/15/2007) - easy to add widgets to add shopping related content to your blog or site. They say the publisher will get 100% of profits
Please let me know if I have missed one of your favorites and I will add it to the list.