Here are the Adsense Alternatives that are available to webmasters wishing to monetize the web!
Adbrite
AdEngage
Adgenta
Adhearus
AffiliateSensor
AllFeeds
AlternutAd
BannerBoxes
BidClix
Bidvertiser
CBProSense
Chitika (Falling Fast!)
ClicksAdsDirect
Clicksor
ContextWeb
Enhance Interactive
ExpoActive
Fastclick text ads
InfoGrabber
Intellitxt (Awesome supprt!)
Kanoodle
Mirago (out soon)
Miva (FindWhat/Espotting)
Nixxie
Quigo
RevenuePilot
SearchFeed
TargetPoint
Veoda
Yahoo YPN (In Beta, Awesome payout)