LibraryThing has a new (well, I've never seen it before) utility called The UnSuggester. The concept is excellent: you type in a book that you own/have read/love, and it examines the amount of people who own copies of both books and then gives you a list of the books that you would likely not enjoy, based on the few number of people who own copies of both.
Let's try a few novels, just to give you an idea. Let's take Vinelandby Thomas Pynchon: