I came across this link today and I thought it would be interesting to share. Banned Books Online is an archived collection of books that have been famously banned or censored throughout U.S. history. It's not a complete collection, but they have some pretty well-known and surprising titles (Apparently the Bible has been banned in classrooms a few times). They don't just list the title--they also give a bit of historical information behind the censorship and link you to a free downloadable copy of the book.