I'm going to be moving out soon (grad school), and I've been doing a little research into exactly what sucks the most power around the house, with a view of keeping my electric bill lower. We have 4 Macs and one PC that are used regularly, 2 of which generally run 24/7, although they are usually idle. I also have a LaserJet 4M which is always on, as well as the necessary ethernet hardware for everything. Surprisingly, All these computers seem to draw much less power than our two TVs (27" and 32"), which draw the most electricity of any device in the house. I can actually see our meter speed up when the TVs get turned on. Looking at our electric bill, leaving the Laserjet and 2 computers on (and using the other 3 daily) seems to have had little effect on power usage. I was under the impression that it would have made a bigger difference.