Traditional computers average 35.5 watts in standby, while laptops average 16.5 watts, according to a 2005 survey conducted by Australia's Ministerial Council on Energy.

FORBES: Your Power Bill Is Standing By

It's also more energy-efficient: The Twenty generates little heat and, in our tests, drew less than 1.5 watts on standby (the AirPort Express pulled more than twice that), which means you can in good conscience leave the Twenty plugged in and turned on, ready to play on a whim.

WSJ: Stereo Sound, Rekindled