The Invention of Hugo Cabret by Brian Selznick won the Caldecott - it's an astoundingly imaginative book. Read the NYTimes article here, which includes some images from the book - it's a thick'un, with text and pictures, not at all a quickie bedtime read for tots. I've given two copies to adults as presents in the last six months.
Newbery Medal: Good Masters! Sweet Ladies! Voices From a Medieval Village by Laura Amy Schlitz.
Full list of all prizes on the American Library Association site.