Check out the latest OpenX ad serving platform. Great solution for bloggers and affiliate/publishers! Here's the info from the OpenX site.
OpenX is a powerful ad serving solution that puts control over online advertising back in the hands of publishers.
The free, open source ad server trusted by more than 30,000 web publishers in over 100 countries around the world.
Singup Here: http://www.openx.org/hosted
Be sure to join the Facebook Group:
OpenX hosted beta
We're currently developing on a hosted version of OpenX. This will make it much easier for all web publishers out there to use OpenX, since they won't need to worry about installing or hosting on their own webserver. It's a pretty big step forward for the OpenX Community and there's still a lot of hard work left to do.
We want to get the OpenX Community involved early so we can shape the hosted product based on your feedback. As such, we are looking for publishers to take part in beta testing. Our first rounds of beta testing will only involve a handful of people, but we will involve more and more testers over time.
If you'd like to take part, just fill in the form below and we will keep you up to date with new developments.
Hosted beta testing registration form
Shawn Collins mentions that OpenX is offering a Market program as well. This from Shawn's blog:
"The folks at OpenX also have a new opportunity rolling out called OpenX Market, which will enable affiliates to put their ad inventory out there for bidding by advertisers."
You could signup for the Hosted program and Market programs.