Are we not living in the ultimate Mega Man future? These rolling cameras by Remington Technologies, a subsidiary of Remington Arms, can be thrown into a room ahead of an invading force in order to scope things out. Each ball can take video as it rolls or stay stationary. A wireless connection controls the rotation and camera angle and the balls transmit audio and video.
You can even drop these things off a two-storey building into the thick of things.
Rolling Camera Eyeballs Danger [Wired]