Honestly, I like every book that I finish. If it's not well written, or if the story doesn't enthrall me in some way then the books gets returned. But this is the nature of my professional life- a librarian needs to read very widely in order to be good at their job. So favorites? That's too hard to do for me.
But I have a long list of books that I've only gotten fifty pages into.
Speaking of which, here is one of the best reviews
of the Da Vinci Code, ever.