worth a look: Boston dynamics' Rhex, Little Dog, Big Dog videos.

Fred Hawkins

A prop could do this, yes?· http://www.bostondynamics.com/content/sec.php?section=LittleDog

This one has a wonderful recovery from a kick:· http://www.bostondynamics.com/content/sec.php?section=BigDog

Rhex' best scene is its scamper in last 15 seconds: http://www.bostondynamics.com/content/sec.php?section=RHex

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Mike Huselton

The robot in the last video is propelled by something called "whegs", a one-piece flipper combining the concepts of wheels and legs.

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JMH