Seaswarm is a "fleet of autonomous and self-powered robots" that communicate with each other via GPS and WiFi to collectively clean surface oil from a spill. Each Seaswarm robot looks sort of like a floating laser printer and pulls around a conveyor belt outfitted with a special reusable oil-absorbing nanomaterial.
[youtube]http://www.youtube.com/watch?v=vruZVg6j9-I
Sounds impressive, right? It is. The Senseable City Lab estimates that a team of 5,000 of these robots could clean a spill of Deepwater proportions in a month. The concept has been "tested" in the Charles River. No word if it's going commercial yet.