USB Refrigerator

Not quite, but per the CEA's "SmartBrief" (citing the
New York Times), "CoolIT Systems's U.S.B. Beverage
Chiller uses power from any PC or Mac to chill beverages.
The gadget works like a hot plate or mug warmer, only
with an opposite, chilling effect.

Uses Peltier effect which I recall is inefficient compared
to compressor cooling.

http://www.coolitsystems.com/