What's google books?
Search the full text of books to find ones that interest you and learn where to buy or borrow them.
How about that? Basically, it's an archive of books, some in their full text, some partial and some are only listed. Either way, it's a worthwhile resource to look up a book that's been shadowing you.
Check it out; it's pretty neat. Keep in mind that like gmail recently was, this is in it's beta stage.