1. The font is a bit small.
2. Instead of using a darker color for a:hover, use pure white or something that accents the link, not that hides it.
3. The dropdown arrow for the DHTML menus doesn't look like an arrow (at least to me) nor does the blue match the color scheme. I would replace it with the default vB arrow, possibly colored to match your style.
4. Move all non-content such as the Latest Discussions and Mouse Points to below the fold. Users do not want to read this first; they want to access your forums.
5. 91 XHTML validation errors:
http://validator.w3.org/check?uri=ht...%3Fstyleid%3D1