I will give you 10 competitors of adsence AdBrite Bidvertiser Chitika Infolinks Pocket Cents Kontera Clicksor Exit Junction Dynamic Oxygen AdBull These are other 10 ad companies for which you can choose for, if your adsence is banned or you are not getting any ads on your site. So best of luck for affiliate marketing...
Second best option is chitika and if your account is approved for GOLD from Silver then you'll get more revenue.
infolinks or clicksor are good if your site has much content, but for less content site Chitika is good
from our experience.. that's probably AdBrite. there are many more though as many have said previously... Chitika, Infolinks, Kontera, Bizrate. CB ads also work for some sites. Buysellads is not bad for many types of sites. last but not least, there's also Digital Point Ads