Ball shaped (Spherical) robots

Would you share with us if you know any URL for ball shaped (sphere) robot? Any design/implementation details/ideas how they work?
URL List Ball Shaped Robots: (1) Rotundus http://www.rotundus.se (2) Mobile Ball-Shaped Robot http://www.automation.hut.fi/research/robotics/ball/ballrob.htm (3) Roball http://www.gel.usherbrooke.ca/laborius/projects/Roball/index.html Roball-An Autonomous Toy-Rolling Robot http://www.gel.usherbrooke.ca/laborius/papers/WIRE00.pdf (4) RoboMaid (***) http://www.robomaid.com (5)
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Miem wrote:

Tumbleweed:
http://www.jpl.nasa.gov/news/features.cfm?featureH6
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Miem wrote:

par_cho|r - gyrates to music http://visionenkessel.de/projekte.htm
- dan michaels www.oricomtech.com ====================
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