Check out http://www.neowin.net/comments.php?id=14694&category=main to get an idea of what Longhorn will look like (no, this doesn't have the new Aero stuff yet, although Microsoft is supposed to show that off at the PDC). I think it's pretty damned sexy, although I must admit it looks a wee bit like brushed metal. I especially like how the menu bar and address bar were integrated into the caption bar in the new Internet Explorer.