Neil Gaiman is an amazing author! Any of his books are good. Try Neverwhere, Stardust or Coraline.
Any books by Scott Westernfeld or Neal Shusterman are really good too.
Any books by Amelia Atwater-Rhodes are amazing! There is In The Forest of The Night, Demon In My View, Shattered Mirror, Midnight Predator. And then there is the The Kiesha'ra series: Hawksong (the best in the series!), Snakecharm, Falcondance, Wolfcry and Wyverhail.
Blood and Chocolate by Annette Curtis Klause
The Princess Bride by William Goldman
Abarat by Clive Barker, Make sue you get the hardcover version though!!! If you liked the first one be sure to check out the next book in the series Abarat: Days of Magic, Nights of War.
Daughters of Destiny series: Keeper of the Winds by Jenna Solitaire, If you enjoyed the first one check out the next three books in the series. Keeper of the Waters, Keeper of the Flames and Keeper of the Earth.
The Abhorsen Trilogy (Sabriel, Lirael, Abhorsen) by Garth Nix
The Maximum Ride series (The Angel Experiment, Schools Out Forever, Saving the World and Other Extreme Sports, The Final Warning) by James Patterson
His Dark Materials trilogy (The Golden Compass, The Subtle Knife and The Amber Spyglass) by Philip Pullman
A Great and Terrible Beauty, Rebel Angels and The Far Sweet Thing by Libba Bray
The Riddles of Epsilon by Christine Morton-Shaw
The Cry of the Icemark by Stuart Hill
The Haunting of Alaizabel Cray by Chris Wooding
Inkheart and Inkspell and Inkdeath (coming soon!) by Cornelia Funke
The Thief Lord by Cornelia Funke
The Inheritance Trilogy by Christopher Paolini
The Chronicles of Narnia (7 books) by C.S. Lewis
The Hobbit by J.R.R. Tolkien
The Lord of the Rings trilogy by J.R.R. Tolkien
Harry Potter series by J.K. Rowling
Uglies series by Scott Westernfeld
Tuck Everlasting by Natalie Babbitt
The Sight and Fell by David Clement-Davies
The Prophecy of the Stones by Flavia Bujor
Old Magic by Marianne Curley