There's a horizontal scroll bar. It seems to me that you have large enough margins on either side to eliminate, as they are much annoyance to those of us using 800x600.

Your icon pictures could use a drastic size reduction. While using PNG is admirable, there's no reason why a static image that's 85x85 should be 50-100kb. With all the pngs on there, it takes quite a while to load on a modem (admittedly that gives me more time to type this) so reoptimizing your images would be a very good idea.

A few horizontal rules on your sponsors page would make it a bit easier to read, and maybe combine the smaller logos to two on a line so it looks a bit more organized rather than slapped down in a line.

But overall, very nice and clean if a bit wide and heavy of images