You may have seen the news, the 2010 Census results are in the first stages of being released, raising many political and economic questions and issues. The Census site linked to above has many sets of data and tables to look over, showing population change over time etc. The important issue of apportionment of House seats is covered too with copious data and charts. Don't miss their "Amazing Apportionment Machine" video!
The library, and your blogger, are back at work after the campus holiday shutdown by the way, and look forward to working with you this winter session :-)