“There must be something in books, something we can’t imagine, to make a woman stay in a burning house; there must be something there. You don’t stay for nothing.” — Fahrenheit 451
From September 22-28, if you don’t already do so on a regular basis, celebrate the freedom to read with Banned Books Week. To get an idea of what books are being banned, the American Library Association maintains a map of the US of where books have been challenged and/or banned since 2007.
View Book Bans and Challenges, 2007-2011 in a larger map
There is also a category on Acid Free Pulp, which organizes the posts that are concerned with Banned Books (when I remember to tag them). Take a look here.