PLEN, the Desktop Hobby Robot is a little (9-inch tall) robot from Japan which is capable of balancing itself on a mini-skateboard or to skate on its own included rollerskates.
Here’s a video of the robot in action:
PLEN’s 18 joints can be controlled remotely using a Bluetooth phone and can run for about 25 minutes on a single charge. Created by Systec Akazawa, PLEN is available from Plen Japan for 262,500 Yen (appx. $2220 USD)