Mine so far would probably have to be Trials of Death in the Darren Shan books but you would have to read Cirque Du Freak, The Vampire Assistant, Tunnels of Blood and Vampire Mountain to understand it.
I much prefer non-fiction, so I would go probably go for "A Sort History Of Nearly Everything" Bill Bryson. Out of fiction books though I like the Unfortunate tales series (their so happy and cheerful).
That would be, Tithe : A Modern Faerie Tale & Valiant : A Modern Tale of Faerie I love those books. There's one more, Ironside : A Modern Faery's Tale, but I haven't read it...yet!
I quite like "A short history to nearly everything" by bill Bryson. Then again "The BFG" by Mr. Dahl is pretty good to. Errr... and Hitch Hickers Guide to the Galaxy is pretty good.