Check out the geographic viewing patterns of 2009's top films from Netflix. It's an argument for film as sociology, if you know your region well. It's also evidence of segregation, not just by race but by age and politics (and even sexual orientation). In the D.C. area, for example, there is a military base surrounded by an African-American area, so you can see which films make the base pop out in a different color, and which films appealed to both groups.
You can rank the films by number of rentals or metacritic score. That one is also fascinating, as you can see which neighborhoods "The Critics" represent! And which neighborhoods they don't.
Another great webpage from the New York Times, which seems more and more to make the most intelligent use of new web tools.