I filled out a survey on home energy usage for my electric company and they sent me a whole box full of energy saving goodies. ROI about 2 weeks!
There was a 'smart' power strip among the items. I'm using it to power our rarely-used downstairs TV & peripherals. I plugged the TV into the smart outlet, and when I turn it on/off everything else goes on/off. "Off" in this case being completely powered down, no standby. Nice!