Using liquid nitrogen with a Peltier effect device to generate a massive 45 mW of power with a temperature differential.
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These are semiconductor heat pumps that use electrical energy to cool one side and heat the other. This 100 W device runs on 15 V 6 A or so and are meant to cool Pentium like processors. It requires a good heat sink to get rid of the heat and preferably fan cooled. There is an optional controller to fix the temperature between 30 – 40 C
Ice is forming on the top plate while the fan-cooled heatsink is getting hot as it has to handle the 100 W input plus about 50 W of heat pumped away from the top plate. 
A smaller Peltier device from inside a laser component which I have mounted on a small heatsink and fan.
Peltier devices can be used in reverse to generate a voltage from a temperature difference. Here is the 100 W Peltier device generating 126.6 mA at 359.3 mV which is a total of 45 mW. I have poured liquid nitrogen on to the top surface.
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Photo Date: September 9, 2004