As I've mentioned before, I am a fan of the Harry Potter stories and universe, so it's not to be unexpected that this teaser trailer would show up here. I am curious, however, to see how future trailers focus as this one is almost entirely on that he-who-must-not-be-named fellow.
Update: You can check out the various film incarnations of Tom Riddle (aka Voldemort) at Peter Chattaway's FilmChatBlog.