Fujitsu Siemens ships 0 Watt 20" and 22" Monitor
 

Patent-pending zero-watt power save technology means the new SCENICVIEW ECO monitors draw no power when not in use - as the DC power converter shuts down completely. This is a world first, because monitors in standby mode normally continue to draw between 1 and 6 watts of power. The Eco mode is enabled by default.

In September, two more models will join the zero-watt monitor line-up: the 24-inch and 26-inch models. The SCENICVIEW ECO model monitors are available to order immediately, in all countries across EMEA. Prices start at 419€ for the 20-inch model.

http://www.biosmagazine.co.uk/article.php?id=6331

or you could buy a power brick with a master switch and flip that to turn off both PC/Screen and get zero watt when you're not using your PC/Monitor.... seriously