http://offensivest.com/books/ ranks the most vulgar English books. The books are from a DVD released by Project Gutenberg. The offensiveness scores for individual words and word phrases come from votes cast by visitors to The Online Slang Dictionary (http://onlineslangdictionary.com/).

It desperately needs an "About" page describing the data and the methodology.

Later, I hope to expand the number of books we analyze and also analyze other forms of media.