Anyone else didn't see the other forum categories?
You know how when you go on the forum page you have the 12 categories at the top? Well, initially I completely missed the arrow on the right of those. So I didn't realize there were more topics until just a few minutes ago.
I think it would be useful to either make the arrow more obvious (add some color) or better yet, use that metro-inspired content overflow trick, where the categories from the next "page" are peeking a bit on the current one.
Oh and I just noticed - this page doesn't have a favicon, you forgot the entry in the <head>