Personally I think this is cool:
http://bits.blogs.nytimes.com/2009/05/2 ... -computers
And I can think of a 1,000 uses for it. The article also link to some commercially-available models, so it's not a pipe dream either. Prices are higher now, but they normally fall after some time in the market.
Some more generic info here: http://www.h-online.com/open/Marvell-ch ... ews/112713