Clay is, as usual, awesome
Well, I finally watched Donnie Darko, and I have to agree with Clays opinion - while it brings up interesting topics and presents some of the more cookie-cutter time theories, you could get a much better feel for time travel and multiple universes by reading (yes, reading, the mainstream world is aghast!) the first few chapters of Timeline. It was like the movie jumped out, yelled "TIME TRAVEL!! MULTIPLE UNIVERSES!! ALTERNATE TIMELINES!!" and then jumped back into the bushes, leaving those who haven't heard/studies such things before going "wow, that was crazy" and everyone else saying "what the fuck was that all about?"