Airlock - Hands-Free Security for the Mac.
I tried out this piece of security software for the Mac tonight. And it's brilliant! Works via bluetooth. All you have to do is pair your iPhone with it, and set the activation range, and you're good to go.
Walk far enough away from your Mac and it locks up your Mac for you. Return, and it magically unlocks it for you. You don't need to press anything, you don't even need to remember you've got it installed and switched on. It's as seamless as you can get, and fits in well with the Apple philosophy.
What's the kicker? It's only $7.99!

