GreenSwitch rewires your home with single-control outlets, each outlet can be designated as green or standard as needed. All you need to do is flick a single switch and all of the electronics in the home that run on standby power—and plugged into green outlets—are turned off. A system like this can save 8% to 10% a year in energy bills and "costs between $500 and $1000 for an average home." That means it's paid off in three to five years. If the installation prices get cheaper, it will be a pretty fast money-saver.
From Gizomodo