There is an element of "why did it take so long?" in reports surfacing of the zero-watt monitor from Fujitsu Siemens. It's a flat panel LCD which contains a relay switch that automatically interrupts the power supply when the video signal from an attached PC subsides. Instead of going into standby when idle and consuming a low voltage, the monitor consumes none at all. When the video signal returns, the relay switches the other way and electricity is returned to power up the monitor.