Mac OS X only: Shareware application Lights Out is your Mac's default Energy Saver tool on steroids, allowing users to set very specific energy saving settings. From setting the time before your monitor dims to automatic logout or shutdown to hot corners for quick sleeping, this simple application takes control of nearly every energy-related aspect of your Mac. Lights Out is free to try, costs $US8.99 for a license. We normally steer clear of shareware apps around here when we can, but in the spirit of living greener, Lights Out looks like a great software. If you know of a free alternative, let's hear it in the comments.