Plump hobbit actor Sean Astin has been interested in directing for some time, having tried his hand at a couple of short films and an episode of TV's Angel recently. Now he's ready to hit the big time, and has optioned a book that he plans to turn into a movie. And Sean's not starting small - he wants to tell the story of the worst natural disaster in American history (and no, we don't mean the TV show AfterM*A*S*H). "I optioned a book called 'Issac's Storm' by Erik Larson," he told MTV. "It's a story about the Galveston, Texas,...