sem4u - 9:09 am on Oct 13, 2011 (gmt 0)
I have tried using Bidvertiser. It was good in the past with OK CPCs, but very low CTRs. They also allowed you to select the ads that you wanted to appear on your site. Now they no longer offer this and you cannot block any ads. Even worse they offer fly-in ads that you cannot opt out of.
I have used Kontera and it worked reasonably well, but nowhere near as well as AdSense.
Where is the Bing contextual ad network? This is what we really need.