http://www.newscientist.com/news/news.jsp?id=ns99994816
The gist is thus : make a grid of fine electrodes, physically slightly separated from eachother. Set a voltage between the first two rows, which ionizes some air above the edge and sends in towards the second row. As it's about to touch the second row, the voltage is turned off and another voltage is set up between the second and third. Repeat across the entire grid, and start another sequence regularly (such as whenver the air you first moved is about to touch the third, start at the first and the second again). The idea is that since the moving cover of air is always in contact with the metal and is not held still against the metal a lá supermarket freezers.
A cool little idea, I thought, except that I'd be uneasy putting electric charges on my processor face that weren't a part of its calculations (thermal pastes have to be nonconductive, or they interfere with processor operation, or so I'm told), and I'd think that this method produces a lot of heat.
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