Use your USB Flash Drive to Lock Your Computer

Link to Application Here.

"You can lock and unlock your computer with a physical device, pretty much like they do in the movies. Use the free PREDATOR application, which turns a USB flash drive into an access control device – a key for your computer. When you leave your PC, unplug the USB stick and your computer will be locked. When you return, plug it back in and your computer will be unlocked. It's like using the Lock function in Windows, but you don't have to type your password when you return. When you unplug your USB flash drive, your open windows will minimize and your screen will go dark – plug it back in and your screen will turn back on."

4 More awesome USB tricks --> link to article here.

take it easy ;)