It looks pretty cool I think, I do agree with Wildhoney though that you're wasting some space there, it's above "the fold" and people will look at it all the time, maybe add a short description of the site there, and hide it for people who are already logged in and know already.

I was having some problems with links though, for instance the about page doesn't lead me to an about page but just the home page, same thing for the "more.." link at the top right about the competition. That definitely needs to be fixed, broken links will never make your visitors happy..