Here's a far-from-final mockup of the front page

As you can see, there is still some blank space around the middle, but I can't really think of anything beneficial to fill it.
I've decided I don't really like listing the new forum posts on the front page -- not especially useful, IMO.
I'm also planning having the browsing of posts look more like this
http://www.smashingmagazine.com/category/showcase/
Having a small graphic on the side and a short intro of text.
What are your thoughts?