In System Preferences -> Mission Control -> Hot Corners, you can set the display to power off when you move the mouse to a specific corner of the screen. I use the top left one myself - when ever I will leave the computer for just a minute or two, or while listening to someone in a meeting / lecture / whatever, I just move the cursor there and power the display off, while the computer keeps working. Just touch the mouse pad again and you're back to the brightness you had before. Saves tons of battery.Random question; when you turn the screen brightness all the way down it turns the backlight off but the LCD actually stays on. Is there a way to set it so that you can turn the screen off at will? That would be nice so I could leave my computer downloading or rendering something with the screen not using any power or still showing an image.