[tungwaiyip]

I carefully measured everything in my household. Nothing come close to a space heater. Most small electronics use negligible amount of power. We should not need to pay any attention to them.

http://tungwaiyip.info/blog/2011/12/24/home_power_usage

There are probably a separate category of problematic electronics that really sucks power. I was offended to find my set-top box suck 18W. I am doubly offended by your array of Tivo boxes. For 40W, my laptop will be doing computation intensive task with the fan running loudly. My mac mini consume only 11W when idle. A big huge TV would use power. I only have a 32" TV and I use it only a few hours a day at most anyway.