You could also do something like $.10 a visit to the site. Every time someone downloads the image for the banner it gets tracked and by downloads I mean every time they visit the site. It downloads all the images to that persons temporary internet files. So, for every visitor to your site you would get $.10 jeff. That could add up very quickly. Obviously you could charge friends less or not at all for advertising but for things like the mustangtuning.com and summit.com ads and stuff, that might be the way to go.