Got myself an energy meter over the weekend and have been plugging things in to measure power consumption. The iMac was interesting because in sleep mode, it consumes 3 watts, but when it's powered off, it also consumes 3 watts. This is good since I never power off the iMac completely. I have the 24" Aluminum 2.4Ghz. At idle it's around 95 watts, and while playing back a 1080p x.264 video, it's about 115 watts. Other stuff of note: - Almost every AC adapter wall wart draws about 2-3 watts just plugged in - Xbox 360 draws 7 watts when it's off - My 12" Powerbook G4 only draws 15 watts with screen at half brightness. Wow!