The L.A. Times conducted an excellent interview of Christopher Nolan, where he discusses Batman Begins, the Dark Knight, and a possible third Batman film.
Most interesting, however, is his explanation of why his Gotham and Batman would not fit in the latest trend in comic book films, putting different superheroes in the same universe. It shows just how well thought-out his take on Batman is, and why it is one of the best films in years.