Segway

I think I could see myself riding around in that new invention by Dean Kamen. I remember reading an article about his earlier invention, the iBOT, a self-balancing mobility system for the handicap. Disabled people who have tried this machine wept for joy because they found themselves climbing stairs, and "standing up" at eye-level to those standing around them, all things they couldn't do with conventional wheel chairs.

Of course, the Segway probably can't beat a bicycle for the most common forms of tooling around.