Anyone see this, pretty cool, the tire rotates sideways on the Rim:
http://www.metacafe.com/watch/yt-5LduYhx5lDY/hondas_self_balancing_u3_x_electric_unicycle/

Honda's Self-balancing U3-X Electric Unicycle - Video (http://www.metacafe.com/watch/yt-5LduYhx5lDY/hondas_self_balancing_u3_x_electric_unicycle/)
For some reason the first link was not available, this one is.