Check out Apogee and their PPC architecture

The Apogee PayPerClick out of Austin Texas has an awesome setup for people interesting in generating clicks and those interested in getting advertising revenue. Their pay per search model is really an amazing idea that can help you to ensure that your clicks are turning into sales and not just wasting your bandwidth. The users that find your advertisement are typically of higher quality and are clicking it because that is what they want to buy. Check them out.

PPC Austin