Well, the design is less than spectacular. I see you're going for silver & blue, but you used red on some rollovers, and the reason simply escapes me. Also, there are a lot of (mainly green) images in there that spoil the scheme.
There's also a problem with the top nav menu : it shouldn't be autostretch IMO. That is, it's far too big for users with 1280 X 1024 and unsightly compressed for users with less than 800 X 600 (if there are any left ).

I like the fact that the phpBB theme is very similar to the main site's design. Perhaps you should make the rest of the site look more like the forum , it's more unitary.