My three year old loves Spider-man. Was Spider-man for Halloween, has a Spider-man blanket, Spider-man dinnerware, a plush talking Spider-man, several Spider-man figures, Spider-man shirts, and happens to be a girl.
Oh, did I mention she's into Batman, Superman and Darth Vader, too? They're just not quite as cool as Spider-man, though. I'm going to point this thread out to my husband, who is a comic book geek, and see what he says about websites.