Check these out. http://forums.digitalpoint.com/showthread.php?t=32420 http://forums.digitalpoint.com/showthread.php?t=17707
Last itme I used adbrite I got burned in my wallet! Had good traffic but NO CONVERSIONS! I used it on their content network, so have no idea where the ads were actually placed! Ive also heard stories that their traffic is regarded as slightly scammy..!
I have used them on both sides and my opinion..a complete WASTE...you start a project and within 5 mons burn through your budget....much like findology
I have tired them and the company is a trusted and a big one. If you have good amount of traffic you can try it out.
I tried them a few years ago. I didn't get the results I was looking for I believe it's better to advertise directly, no middle men. Like using oio publisher.