The final elements of the viral marketing campaign for "The Dark Knight" - one of the best and most extensive in movie history - is coming to a close. Smartly, the people at Warner Bros. are rewarding fans with a free screening of the film in select cities
. They're all sold out of course and, no, Little Rock didn't make the cut for one of the screenings. Still, it's a neat idea and one that will propel "The Dark Knight" into cinematic history - and not just because of Heath Ledger.