The categories and winners are:
Easy Readers: I Love My New Toy, by Mo Willems
Fantasy & Science Fiction (Middle Grade): The Graveyard Book, by Neil Gaiman
Fantasy & Science Fiction (Young Adult): The Hunger Games, by Suzanne Collins
Fiction Picture Books: How to Heal a Broken Wing, written and illustrated by Bob Graham
Graphic Novels (Middle Grade): Rapunzel's Revenge, written by Shannon Hale and Dean Hale, and illustrated by Nathan Hale
Graphic Novels (Young Adult): Emiko Superstar, written by Mariko Tamaki and illustrated by Steve Ralston
Middle Grade Fiction: The London Eye Mystery, by Siobhan Dowd
Non-Fiction Middle Grade/Young Adult Books: The Year We Disappeared: A Father-Daughter Memoir, by Cylin Busby and John Busby
Non-Fiction Picture Books: Nic Bishop Frogs, written and illustrated by Nic Bishop
Poetry: Honeybee, by Naomi Shihab Nye
Young Adult Fiction: The Disreputable History of Frankie Landau-Banks, by E Lockhart
The page linked to above includes brief descriptions of each book. There are also links to their Amazon.com listings, though of course I highly recommend using these for info only and actually buying from your local independent bookstore.
At the time the finalists were announced, I hadn't read any of them. I've since read The Graveyard Book, which I highly recommend. (It was also this year's winner of the Newbery Medal.) Don't know if I'll read all of these, but some of them certainly look interesting.