We are still under construction for advertising and ad rates but I can tell you some ad sizes:

Ad Sizes...
- Leaderboard: 728 pixels x 90 pixels
- Full Banner: 468pixels x 60 pixels
- Medium Rectangle: 300 pixels x 250 pixels
- Half Page: 300 pixels x 600 pixels

I'll be posting an ad placement description soon along with a count of how many ads will be available for each slot-size.