try findwhat.com something around 500,000 pageviews a month., Or maybe applied semmantics 150,000 to 200,000 pageviews per month (dnforum sponsor).
(not sure on those facts)
I think they might pay 50% of clicks.
Also there is getfound.com I think requires less page views than findwhat.com, Getfound has something affiliated with part of findwhat.com
I think getfound.com pays 35% of clicks, I could see any sign up page though.
I believe findwhat uses xml feed and getfound uses html type code.