[cinq]

I like the header very much , but perhaps you could compress it a bit horizontally , and not let it span the whole page , perhaps 80%-90% of the page would be good.
Also the column on the left is kinda taking up screen space , perhaps make it thinner and as for the main forums display bit , table width of 80% perhaps ?

Overall i think it has a clean look and i feel the colors blend well.

Though like previously mentioned , may be a bit too many forums for a start. Perhaps can merge a few first , when members and activity starts picking up , decide from there if its worth breaking up to more sections.

all the best !