I have a 17" plat panel iMac. The trouble is, I'd like to turn the LCD off without having to put the computer to sleep. Are there any programs for doing this? I have it set it to automatically turn the display off in 10 minutes. But sometimes I'm leaving, and I'd just like to power it down right away. I know on PowerBooks once you turn the brightness all the way down, the last notch turns the screen "off". But on iMacs, the last notch is just really dim, but not off (unfortunately).