Fan site Salon du Sorciere has posted some great scans of promotional material containing production stills from Harry Potter and the Prisoner of Azkaban.
Included are Harry and Hermione sitting and talking, Hermione with Crookshanks, and Harry handling Hagrid's Monster Book of Monsters. Thanks to Amy for the tip!
Just yesterday, a new picture of Hermione surfaced. With the movie's release date still months away, Harry fever heats up with every new picture from the film.
Also thanks to Amourette for sending in the full gallery for our viewing pleasure.