CES 2008 Day 2: From iPods to iShoes: "If you've ever wanted to zip around town like Woz on his Segway, but with a gizmo that fits into a backpack, check out iShoes. Somehow they've managed to come up with battery powered roller skates that can carry you about 3 miles (not quite 5 kilometers) on a single charge, with a top speed of about 13 miles per hour (21 kilometers per hour). I have no idea how safe this is, but it looks like the coolest locomotion you'll ever see until someone can sell us a hoverboard. They're apparently available now, for a mere $599 plus $20 shipping.
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