I'm just starting to gather my thoughts from last night, and I'm also trying to put together some data. David Leip was kind enough to update his brilliant website with yesterday's election results. No turnout figures yet, and I'm not sure all the vote counts are complete, but it's still really helpful.
Anyway, here is a scatterplot showing how Obama did by state relative to Kerry's performance four years ago. The diagonal line is the Kerry line, and Obama exceeded it in almost every state by an average of around 3.2 points. Note the big home state advantage in Hawaii.