After being banned from Google Adsense (I still don't know the reason why) I have used Adbrite as an alternative. It's no surprise they are shutting down. The ads they deliver are borderline suspicious and they don't make publishers any money at all. I have earned $0.07 with Adbrite whereas I could have earned $60 in the same time frame with Google Adsense.
Does anyone know good alternatives?