Like the future? Banana Screen adds face recognition login to your webcam enabled Windows computer.
To use, just install Banana Screen and create a face model. Then set up Banana Screen to lock after a predefined amount of inactivity (or hit Alt-L to lock at any time). Once locked, BananaScreen will keep an eye on faces coming and going in front of the camera. When it matches yours, it immediately unlocks your computer. Cool, huh?