Many segments of the retail market are facing financial difficulties these days, and entertainment sales are no exception. After two flat years, 2007 saw the first real decline in DVD sales "since the disc format debuted in 1997." Maybe it's because of the advent of cheap, home-delivered rentals, or maybe people just finally filled up their wobbly DVD racks and ran out of room. Whatever the reason, an article in The New York Times says that Warner Brothers Entertainment recognizes the trouble it's in. But who can they turn to when they're up against a faceless, powerful enemy? Why, superheroes, of course!