I used PEW a lot when I was writing my dissertation and found their reports very easy to understand. They give an executive summary before the main report and have lots of graphs and charts. Today they came out with the 2008 election report which is quite interesting (and short). The most interesting result is above. Since 2000, women have had the highest turnout amongst eligible voters, but as you can see from above and here in the report, African-American women had a higher turnout rate than white women. The chart is a great way to teach about race and income in relation to voting.