There's not much to say about the Motionbulb that can't be extrapolated from the above image and the product's name: it's a CFL bulb with a built-in motion detector capable of, uh ... detecting motion from up to 25 feet. Walk into a room, light goes on; leave the room, light goes off. 'Nuff said. They say the $20 bulb will last five years, which means it should still be around when those inefficient incandescents go the way of our favorite robo-dog in 2012.

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CFL + motion detector = Motionbulb