Fujitsu has developed a monitor that uses zero power when in standby mode.
“The primary component is a circuit element in the power supply unit of the monitor that is switched by the PC. As soon as the video signal of the computer subsides, a relay–an electrically powered switch–with two switching positions automatically interrupts the entire electrical circuit of the monitor. When the computer signal returns again, the low currents that then begin to flow across the interface are sufficient to trigger the relay and thereby restart the monitor. “
The zero watt monitors will be sold for the same price as a regular monitor starting this summer, expect other monitor manufacturers to follow suit.