My two things would be to enhanse the Question of the Day; and site layout consistency.

For the Question of the Day it would be nice to be able to see not only the question but also the correct answer for those you have already answered.  Currently I can only see the answer I gave and even that doesn't appear to be easy to find.

For the site layout there appears to be to radically different layouts for the main site and for the forums.  Getting the layout and colors the same would be kind of nice.

Just my two bits,

Jereme