Picture Book: All the World by Liz Garton Scanlon, illustrated by Marla Frazee
Middle Grade Fiction: Chains by Laurie Halse Anderson
MG Fantasy and Science Fiction: Dreamdark: Silksinger (Fairies of Dreamdark) by Laini Taylor
Note that both of the award-winning graphic novels, The Secret Science Alliance and the Copycat Crook by Eleanor Davis for middle grade and Gunnerkrigg Court: Orientation by Tom Siddell for YA, are reviewed in my recent "Getting Graphic" post.
And Pam Turner's wonderful book, The Frog Scientist, won for YA nonfiction! (It's equally accessible to middle grade readers, so they shouldn't miss out.)