I found these while browsing gizmag (an Australian site BTW), and they are infinately cooler than The Wave.
You have one skate under each foot and use a snaking motion to move sideways. These look perfect as something that you can just throw in your bag when you’re not using them (much better than inline skates or a skate board in this regard).
Check out the promo video on the manufacturer website. There’s also an instructional video on YouTube.