Has or does anyone here use banner or button advertising to advertise your affilite site or blog? If so did you advertise through a network or individual basis?

I recently started using projectwonderful dot com. The price ranges based on the site you are advertising on and the type of ad you want to run. I get a little traffic but not really making money. I'm just wondering if there are any better banner networks I could use.

Funny thing I actually liked making the banners and buttons as much as websites.