Halluc II a robot developed by Japan's Chiba institute of technology has 8 wheels and a lot of sensors. It can move in six mysterious ways, including going forward, sideways, up steps and slopes. Weighing 44 pounds and at 31 inches long the eight wheeled cockroach fuses robot and automobile technology and works off a Linux OS.
Halluc II the Transformer tank robot runs on Linux (Translated).
Original article in Japanese:
http://robot.watch.impress.co.jp/cda/news/2007/07/26/578.html