Note: I chose to illustrate with the MythTV box because it is the most power-hungry of all of the sytems we have here.

My "daily" workhorse is a 17" notebook (34W in normal use, including the 1920x1200 display panel), and our 24/7 server is now an AMD Fusion board that idles at about 23W with two drives.

Everything else here is also under 50W in normal use.

Cheers