I wanted to contribute to this section because I'm hoping to earn some reputation points ( I wonder how they work? ). Here is a list of the Publisher Network Providers I know about, I hope this helps people who are searching for ad placement on their websites. adsense bidvertiser (some report not being paid, good minimum payout tho) adbrite chikita revenuepilot searchfeed clicksor ypn(yahoo publisher network) Allfeeds cpxinteractive rightmedia paypopup(good pop under network) mediaprecision casalemedia advertisingz adengage etolohy adultads.biz burstmedia vibrant media doubleclick fastclick revenue falkag.com adbolt contextualchoice.com azoogleleads.com (thanks to Ian) tribalfusion If I have omitted any, please feel free to fill the void.
Adding Kontera to the list, it's a contextual link advertising program for advertisers and publishers.