One book that changed your life: The Outsider (Albert Camus) -- This one would probably seem like an odd choice to a lot of people, but I learned a lot about my life and the bleakness of the atheistic viewpoint by reading this book.
One book that you've read more than once: The Hobbit (J.R.R. Tolkien) -- I suppose the Lord of the Rings could be included with this.
One book that made you laugh: Out of the Silent Planet (C.S. Lewis)
One book that made you cry: I think I might have almost cried reading Perelandra (C.S. Lewis)
One book that you wish had been written: Everything you ever wanted to know about NMR but were afraid to ask
One book that you wish had never been written: I'd rather not list it here
One book you are currently reading: The Theory of Poker (David Sklansky)