Here is a list of Adsense alternatives , if you are banned or in need to earn more revenue from your advertising space .
YPN:(Yahoo Publisher network : YPN is the best Adsense alternative , but currently they only accept sites from US/UK .
Other ad networks :
Adbrite ad networks
Kontera 
In text advertising)
Infolinks :
Chitika (Affiliate Network)
Amazon affiliate
Blacklabel ads (Adult advertisement)
Blue Lithium
Adagency1
Barzdo Media
Click Booth ad networks
Casale Media
CPX Interactive
Gorilla Nation
Real Cast Media
Inter Click
Vibrant Media
Value Click Media
Ad Pepper
Ad Smart
Ampira Media
Adtegrity
Komli ad network
Tyroo
ad magnet
Banner Connect
Burst Media
Tribal Fusion
Tacoda
ClickThruTraffic
Real Tech Network
Viralytics Media
Morning Falls Network
Turn Ads
Pogads
Value Click media
Double Click
Cubics
Fast click
Revenue pilot
Adtoll
CPM Bucks
Target Point
Bidvertiser
Clicksor ad networks
Except YPN , all other adsense alternatives are low paying . But you may give a try for Kontera and adbrite with good traffic .