Looks good!

The only thing that jumped out at me is the Flash on the homepage. In Firefox/3.0+Linux, the Flash background isn't transparent, so you see two gray large boxes instead of the pretty green thing underneath.

Flash seems to have a handful of glitches like that under Firefox+Linux. You could slice that part up and put some pieces in the flash itself. I think there is also a hack that involves using a hidden iframe, but I haven't looked into that. Unfortunately, under Linux/Firefox, wmode=transparent isn't supported.