In the North Hall at CES 2010, DKO International was showing off their new energy saving HiSaver power strip. Using a motion sensor to detect movement, or rather lack of movement in that it shuts down the power strip after 10 minutes of inactivity.
The strip also features a separate input for your computer so it can stay awake throughout shutdown. Both the motion sensor (w/ 6ft cord) and the strip itself are mountable. Capable of withstanding a powerload of up to 1,875 watts, you can daisy chain this with other power strips but you run the risk of blowing it out.
Two versions will be available, one for your TV and one for your PC. The TV one shuts down in hourly increments of 1-3 hours and the PC one shuts down after 10 minutes. Intended to save you between $65 and $100 a year in bills, both versions will sell for $99 and will be available soon.