CNN has a great website up called "Balance of Power" that breaks down each individual race. It has vote distribution maps for every state plus complete exit polling results. (Voters with post-graduate degrees went 70% for Bob Casey, Jr. in PA.)
If you're a political junky, the site will definitely keep you from getting any work done today. Go check it out.
On a side note, does anybody know of a national Red/Blue House of Representatives map for votes by county?
2006 Election Results