Those are via Engadget.
Also there's the AirRay:
I got to see the AirRay as well as a couple pneumatic water-dwelling robots on display at the Design and the Elastic Mind exhibit at the MoMa on Sunday. I'll be posting some details of all I saw there here or on the other blog before too long. So neat!
OH! And this is a natural place to link Theo Jansen's Strandbeasts, kinetic sculptures that Jansen speaks of as living beings that will roam the beaches.