Hi Star,
Well a few things...
The welcome message is far too big for the page, takes up too much of the forum. Seems like your padding is quite large as well. I'm not fan of your lay out although I'm a vb traditionalist so forgive my opinion

Because the main forums are wide, the last post gets lost and my eyes just focus of the forums. I think if you reduced the size of everything a bit it would look much better
The colors are very warm and easy on the eyes.
Gabby