One of my favorite tech writers, Alex Pham, had an article in the LA Times Business section, Sunday 2/24, titled "Shrink Your Energy Footprint" - an informative article that reveals how much energy is lost when you are not using your gadgets (phantom loads). This helpful little chart comes from enviroharvest.com and tells you how many watts/hr. each of your electronic friends spends simply being plugged in. Alex lists a bunch of really great resources for "taming your power beasts". (SmartStrips. Solio, solar backpacks, etc.)
Consumer electronics left idle, or in stand-by mode, suck as much as 25% of their power when not in use. Computers can draw up to 85% when left on. "Phantom loads" add about $28 to the average annual household power bill.
Check out her article - and for those green tech heads - read all of the articles by Alex Pham, she really does her homework on "green electronics".