Looks pretty cool. I can definitely dig the header.
Only criticisms:
-Make color behind each category name a different color. The dark really doesn't go well with the rest. Maybe something bright, but not too bright?
-Get different new posts/old posts buttons. The vB ones are horrible.
-Change the second alternating color. It's again to vB-ish and looks out of place.
Well done though! Looks good!