Didn't Slumdog Millionaire also get a recent re-release? It was in theaters last year, and due to a grassroots buzz, it came back to theaters in 2008. I have yet to see it, but everyone who has seen it says it's good. Then again, Slumdog Millionaire isn't a blockbuster money-making title.
Yeah, but there are limited to wide releases all the time. Lots of low budget movies have a decent initial run in a modest number of theatres, and so are given the chance to "swim with the sharks," so to speak. It's unusual for a mega blockbuster like The Dark Knight to see something like this. I'll be in costume, midnight, etc. etc.
Also, Slumdog Millionaire is a fantastic film that you should all go see.