[Uber Gizmo]
… One of the more creative and newer methods of combating crime and potential terrorism would be to use the Groundbot spherical surveillance robot which hails from Sweden, where it can roll through mud, sand, snow, or heck, float on water if it need be – while using its pair of cameras to deliver its remote operator with a live live video feed – in stereoscopic 3D, no less. …
Moving around at a top speed of 10 km/h (6 mph), the GroundBot can be said to be virtually inaudible, where knobby tire treads help it be ready for all-terrain operation.
See the full story here: http://www.ubergizmo.com/2011/10/groundbot-spherical-surveillance-robot/