The American Library Association (ALA) has an annual Banned Books Week to remind people that "Free People Read Freely." They pick late September to catch students and educators in their first month of school.
The good news is that, for the most part, books are not banned for everyone. The lists the ALA publishes are books that have been challenged. It's amazing to me that things like Judy Blume's Forever and JD Saligner's The Catcher in the Rye are still on the list of challenged books. At least my childhood-favorite Huckleberry Finn is off the list (this year).
[Pointer from j's scratchpad]