“UnSuggester takes ‘people who like this also like that’ and turns it on its head.” You know how some online retailers take search or order information you enter to “helpfully” suggest other things you might like? (Helpful in that it helps the retailer get more of your money!) UnSuggester does the opposite. You enter the name of a book you’ve read, and it will supply you with an impressive list of books you will probably not be interested in.
I hope somebody comes up with UnSuggesters for movies and music.