Eee... Adsense... Overture... Adverts...

If you're going to do adverts - at least tie them in with your site in a more personal way than Google would have it. Go around to sites you like, if you like them ask if they want an ad and how much they'd give you. Write up a nice Ad Script, or use an ASP.NET Ad Rotator and a page to log clicks and redirect and you're sorted.