There's no catch, just free comic books. From teenage angst to the war on terror, comic-book subject matter in recent years has ventured beyond spandex-clad superheroes and maniacal bad guys. Today your friendly neighborhood comic-book retailers are swinging open their doors to promote an often underappreciated storytelling style. Of course, Batman, Spiderman, and the rest of the superhero gang are still in full force, so whether you're a comic fan looking to expand your reading, a bookworm looking to investigate a new style of story, or just satisfying a fetish for word bubbles, today's the day to dig into the nerdy subculture.