Surprisingly, a really cool feature of Windows 7 called 'Aero Shake' has gone virtually unnoticed amidst all of the hype. It is not groundbreaking or anything, but having the ability to minimize all background windows with a simple shake of the mouse seems like a smart, useful idea to me. Check out the video and see if you agree. [istartedsomething]
Definitely handy. I use the mac equivalent (Hide others: command-option-h) about 50 times a day.
Microsoft should really take the useless windows key and make it a modifier key, upon which they could assign system-wide shortcuts like this.