Run your own ad server
If you want to sell ads on your website you might be interested in OpenX. Here’s what the excellent DownloadSquad.com had to say about it.:
OpenX is an open source ad server that you can install on a web server to provide a complete ad management package for your web sites. The software lets you create entries for advertisers, ad zones, and campaigns. You can also apply a whole slew of filters that will do things like show one ad to a visitor in the US and another ad in the same spot to a visitor from Germany.
