Well, I guess I can somewhat congratulate you for atleast not screwing up any icons, but really, this is nothing spectacular at all. The colors are of stock generation, and there is no modding to the stock templates at all. Plus, you themed the forums after a topic that's already got over a dozen websites on, (Gran Turismo, the game series). I'd say, not bad, but in all reality, I've designed tons of forums before, and this one does not stand out.
Hate to be rude, but that's what constructive criticism is.