It's a Picture Book, a Novel, a Movie in Book Form... is another one of those how-they-done-it articles that I like so much. This one is about Brian Selznick and Hugo Cabret.
By the way, I've been seeing questions raised about Hugo getting the Caldecott this year because of the whole question of what is it? A picture book or a novel? Fortunately, I'm pretty ignorant about picture books, and I don't have strong feelings one way or the other on the subject.
Thanks to child_lit for the link.