Yeah, I cheat, but I cheat in brackets...
• One book that changed your life.
Second Serve by Renee Richards.
• One book [series] that you’ve read more than once.
Harry Potter. Every time a new volume or movie comes out I end up watching the movies and re-reading the books up to the current one.
• One book you’d want [if stranded] on a desert island.
The "if stranded" clause is really needed here. Anyway, my choice would be How to Survive Anything, Anywhere by Chris McNabb. Probably be kinda handy...
• One book that made you laugh.
Everything Here Is Mine by that lady who does the Sylvia strips (name eludes me right now). It's a book about understanding Cat behaviour, with many illustrations by the Sylvia-lady.
• One book [series] that made you cry.
When I finished Phillip Pullman's His Dark Materials Trilogy (The Golden Compass, The Subtle Knife, and The Amber Spyglass), I cried for days afterward. I highly recommend it.
• One book that you wish had been written.
Ethyl the Aardvark Goes Quantity Surveying by Edmund Wells.
• One book that you wish had never been written.
Dianetics by El-Ron Hubbard. It's destroying Hollywood's integrity!
• One book you’re currently reading.
Michael Crichton's State of Fear. P gave it to me and said I might enjoy it. It's quite entralling, considering the main character is a lawyer fighting eco-terrorists. That's right, the lawyer's the good guy.
• One book [series] you’ve been meaning to read.
The last three books in the Dark Tower Septology by Stephen King. I've read the first four (and will need to re-read them to get it all back in my head). I never got around to getting the last three when they all came out in rapid succession. As an aside, there have been references to the Dark Tower in other Stephen King books, including Insomnia.