The SeaDoo Seascooter is just a little better than what I learned to swim on (those Styrofoam boards are still pretty sweet). Looking more like an underwater exploration vehicle, this nifty little thing gently propels you around the pool while you work on your leg technique.
Of course, the SeaDoo Seascooter isn't just for those learning to swim. It can also cater to the lazy individual who have had a few too many afternoon beers to be bothered exerting themselves. Ahh, summer, how I missed you.