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I initially looked at these things as part of a renewable power supply system, so using a wood stove for heat,having the units mounted on it to get some electricity, and using water to take the heat away, hence a hot water supply.
There must be a heat transfer for them to generate electricity, so you need a hot and cold side.
Once they get efficiency up & cost down, then there are heaps of applications, the radiator would be ideal as this is where you really want to get rid of heat, but the differential wouldn't be much more than 50C, but if all the cooling tubes were covered with them you could probably still pull 200-300W from your radiator, that's 20amps.
There is also research going on incorporating them with solar cells, to get more power out per sq metre.
Still on the horizon though.
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