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Designed by the creator of the Apple iPod, Nest is one of the coolest programmable thermostats on the market. The thing that makes this "learning thermostat" unique is that is creates a "climate schedule" that is unique to your habits by using historical data. It offers great visual cues (blue when it is cooling things down and red when it is turning up the heat). It was also designed for relatively easy installation. At $249, this is not a cheap gadget. It also happens to be back-ordered, so you might have to give your green gift recipient an IOU into early 2012.