IESB.net has posted a whopping nine film clips, three featurettes, and behind-the-scenes footage of Sweeney Todd. The videos on the site feature interviews with the cast and crew on the film, and actual segments from the movie itself. There are also several new high-quality pictures from the movie on the link. I haven't looked at any of the videos myself, as to avoid any potential SPOILERS. But for those of you who just can't wait, there's plenty to offer from this website.
More can be seen and heard on the official website for Sweeney Todd, too, including song excerpts, production notes, a photo gallery, and downloads.