Your footer doesn't display correctly for me using Firefox 5 but looks fine on IE and Chrome.
Personally I'm not a fan of fixed styles, I always feel that everything is squashed into the given space. On a wide-screen monitor there seems to be a lot of empty (wasted space)...but maybe that's just me
I like the colours and the layout, good range of categories and topics. The only other negative I've got is that the header (logo) is a bit too 'busy' for me.