Well, for first, to improve the header, you could try removing the Break right after it, I think that the header and the -> $bbtitle would look much better without the space in between. As for the header look itself.. I dunno, just doesn't favor my eyes much.
http://forums.hotscripts.com/ has an excellent professional design on their forums, and i'm sure there are plenty more out there that would be beneficial to see for ideas. :X