While I haven't had the chance to read them myself, Evan Angler's Swipe series has some great reviews.
Ray Bradbury - Fahrenheit 451
Kathryn Lasky - Guardians of Ga'Hoole and the sequel series, Wolves of the Beyond. (WotB can be read as a stand-alone series as well.)
Anything by Cornelia Funke ( my personal favorites are the Thief Lord and the Inkheart trilogy.)
Micheal Morpurgo's War Horse and Kensuke's Kingdom.
Lisa McMann - The Unwanteds series. (Unfortunately, my library doesn't always allow requests, so I've only read the first two. They were enjoyable, though.)
Diana Wynne Jones - Howl's Moving Castle
Anything by Marguerite Henry (These aren't your typical cliche horse stories, most are based off of legends or actual events. I recommend King of the Wind, Brighty of the Grand Canyon, and Misty of Chincoteaque.)
R.D. Henham - Dragon Codex series
A. J. Lake - The Darkest Age trilogy.
C. S. Lewis' space trilogy, which begins with Out of the Silent Planet. I enjoyed this more than Narnia.
Dodie Smith - One Hundred and One Dalmatians (Yes, it was originally a book!)
Micheal Ende - The Neverending Story (This was a book, too.)
Lemony Snicket - A Series of Unfortunate Events
Rick Riordan - Percy Jackson and the Olympians and the Kane Chronicles.
John Flanagan - Ranger's Apprentice.
(Me? Read? Who would have thought? >__> )