It's quite nice. I like the header and images, one thing I don't like is the green links though. Even though you have green in your style, the link colour still looks out of place to me.
I also think your side bar is a bit too wide.
Otherwise, very nice.
Oh, and you're also starting off with way too many forums, 10 should be the maximum for a new forum IMO, and then expand as you get more members/activity.