The book contains an introduction by Jake Gyllenhaal (nicely and honestly written), an interview with Richard Kelly (awesomely long and very informative and interesting!!!), the script (of course, as good as I remembered it from the movie - though it gave me some more input and understanding than I previously had), pages from "The Philosophy of Time Travel", and images and sketches from the film.
It is a real treat for fans of the movie itself, Richard Kelly and movie-making in general!