New banner project going on

There are some pretty nice projects going on at the Affiliates group (http://www.spreadfirefox.com/affiliatess). One of our main projects at moment is the creation of a new banner system for SpreadFirefox. These banners will display something different when viewed by Firefox users (so a Firefox user won't see another ad to download Firefox, and instead an ad for SpreadFirefox, Thunderbird, or perhaps another open-source project).

We currently have a few prototypes posted on the group, and could use some critiques. Any help on this project would be well appreciated.

Thanks!

-Jeremy