Review for the main site:
Positives: Firstly, nice color usage and images. They look very professional and are nice on the eyes. The navigation is also very easy to use and the rollover looks great.
Negatives: The Google Ad at the top has got to go. It is distracting and really pulls away from the site. You can place this elsewhere, it just should not go there. For forums it is okay, but for main sites it doesn't work. Also I think before you have that ad at the bottom you should include some type of footer. Also could you alter the colors of the bottom ad to match the site a bit better and shrink it a bit? It is really big and really close to the site. All of the rollovers on the titles and stuff are a bit annoying as well. The grey to orange and orange to grey is contradicting with titles and subtitles.
Review for forum:
Positives: Great location of advertisement. The ad also meets the vibe and feel of the site. I feel this is a very well placed ad. You are targeting the visitors. Nice coloring as well.
Negatives: The only thing I came up with was the header feels a bit too big. Other than that, great job on the forum!
I hope this wasn't too harsh, but I am a nit picky reviewer.
Great Start and Good Luck,