Focus Design's SBU electric self-balancing unicycle($1,500). It is not a conecpt product, Focus Design is actually bring it to the market. Cool! It weighs 24.6lbs, and can move at 8MPH. It controls the forward and backward balance while the rider balances left and right. The rider controls the speed by leaning forward or backward to speed up or stop. A limited release of ten SBUs is slated for early November '08. For this initial production cycle, the cost will be $1500 each. Check out see a video of SBU self-balancing unicycle.