Try bidvertiser and adbrite, both are excellent programs that I use, adbrite also has the advantage of being able to incorporate your adsense code into their adverts so you always get the highest paying ones on display.
If you find this useful please pm me for the referal links so I can earn a little bit for my advice. Of course you can always use google instead and cut out the middle man LOL.
Thats true Spork, but adsense allows only three ad zones per page, as does adbrite. However bidvertiser allows you to place as many as you like so you put 3 adsense zones + 3 adbrite zones (with the same sized bidvertiser codes added) and then some bidvertiser codes on each page.
Basically means you get paid from at least one company everytime someone visits your website and also if sombody clicks on an ad.
Its all good, so long as you don't really overdo it LOL
Kind of got that with adsense. They asked me to remove my adbrite ads but I earn more from them than google so I just dropped all adsense from the particular website and used adbrite instead. Guess what lol, my earnings increased by removing them lol.
They pay a decent amount actually, with proper placement they actually pay a whole lot more than CPM ads. Of course, once you have an established web presence, affiliate ads are the way to go as people trust your choices.