I'm gonna sound REAALY nit-picky here:
I agree with the others; too much animation everywhere.
The "new topic" and "post reply" buttons themselves are a good size, but the text is difficult to read on them and they really don't match the rest of the site.
I don't care too much for the black rollovers. Consider another color (perhaps a lighter shade of blue?).
On the topic pages, the members' names look a bit goudy because of the serifed font and the usage of the "glowing names" hack. It gives it a cheesy look IMHO.
Advice, not for just you but for a lot of other budding hackers,
just because you CAN do something doesn't mean you SHOULD do something. Unnecessary hacks and animations may look nice in some instances, but make sure it looks good on your board first.