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Forum Moderators: phranque
If you are looking for CPC ads on engines, I would recommend the major ones: Overture, Google, LookSmart, Findwhat.
For popups take a look at Gator as they have a huge user base.
Of course, my story could be the exception rather than the norm. I'd appreciate anyone else with experience chiming in, to see if my story is the exception or the norm.