I found this list of most harmful books of the last two centuries via Alex Exler’s LiveJournal. Of course, the harmness of the each book is very subjective and depends on who are the judges. Also, interesting to note, that although books are considered harmful, each entry has a link to appropriate Amazon.com page.
I myself flipped through a couple of books in this list while I was a teenager. Now I am more interested in reading them, but I don’t have any copies around.