Here is a BIG list of adsense alternatives, enjoy!
Clicksor
TargetPoint
Adbrite
BidClix
Chitika
AllFeeds
Adhearus
AffiliateSensor
Bidvertiser
Veoda
RevenuePilot
Kanoodle
Enhance Interactive
Quigo
Intellitxt
Nixxie
InfoGrabber
Yahoo YPN (coming soon...)
Mirago (coming soon...)
Miva (FindWhat/Espotting)
SearchFeed
Fastclick text ads
AdEngage
BannerBoxes
ContextWeb
CBProSense
ClicksAdsDirect
Adgenta
ExpoActive
Any more to add...