Microsoft is toying with a "Step User Interface," to be demoed at their TechFest, which is basically Dance Dance Revolution meets Windows Explorer. Just dance a little jig to run through those vacation photos or maybe some cha cha to skim through a bit of spam in search of a truly great stay-at-home business opportunity. Microsoft even claims they're looking into foot mounted accelerometers "so you really could be just sitting at your desk and kicking your e-mail away under the desk." Of course, there are no plans at all right now for commercialization of the tech, but stranger things have happened.