http://www.eweekeurope.co.uk/news/us-air-force-upgrading-playstation-3-linux-cluster-2614
The US AirForce has revealed plans to purchase up to 2,200 PlayStation 3 games machines as part of a supercomputing project running on an in-house Linux distribution.
According to reports, the Air Force plans to use the devices to expand an existing supercomputing project based on PS3 hardware. The machines use IBM's high-end Cell processor.
Details of how the PS3's will be deployed specifically have not be revealed aside from the fact the system willl be used to “determine what software and hardware technologies are implemented [in] military systems”, reports state.