Trevor Blackwell's self-balancing unicycle.
I got to ride this yesterday. It's like a Segway, but with only one wheel. No pedals: it's just you, a motorized wheel, and your sense of balance. That's Trevor on the right.

Trevor has more photos at his site.
I never had much success attempting to ride a regular unicycle (having only put in about 1.5 hours of what
joshbuckler once told me is the average learning time of 14 hours). But after only about five minutes, i was able to glide for short distances on this amazing contraption. Great fun!
Trevor has more photos at his site.
I never had much success attempting to ride a regular unicycle (having only put in about 1.5 hours of what