There's a new PPC up and coming, it's called Clickriver by amazon.com I've used it a little bit since I run a book discussion website but haven't had too much luck with it yet. The nice thing about these guys is that they actually don't charge a set up or activation fee, the only thing you'll ever pay is whatever you set your CPC to. They are still in beta mode so I don't think they've had this going very long, but since amazon is to bookstore as google is to search engine I have a feeling this will take off.

This certainly sounds like an interesting pay per click program. I haven't heard about this program before so I will make sure to look into it. Thanks! I was running out of PPC options so this will be a great alternative to Google adwords.