Ford created KeeFree Login for your Phone
Ford, yes as in Ford the Car company, has created a Google Chrome browser exention which pairs with your phone via bluetooth to automatically log you in to certain websites automatically when your phone is near your computer.
Automatically log into Facebook, Gmail and Twitter.
When the Chrome browser extension senses your phone via Bluetooth the websites automatically log in.
When you walk away from your computer, they automatically log you out.
Unfortunately the KeeFree browser extension cannot be downloaded, YET!
If you want me to let you know when KeeFree becomes available, please send me your name and email address and I’ll be happy to shoot you an email!
BT Proximity locks your Computer Screen when You Walk Away
How To Geek also has a good article on BTProximity unfortunately when I tried to use BTProximity it would not work for me.