One of our members directed me to this and I'm not sure how I missed it in the past. Phoenix Freeze gives you the ability to lock any Bluetooth enabled PC via your mobile device just by walking away. All you need to do is install a small app on both the PC and your BlackBerry and you're done. You run through a few settings, and when you walk away from your PC with your device it will lock up until you return. Freeze allows you to setup the "zone of safety" or distance before it locks. You can walk away knowing you data is safe. When you return it unlocks and you can continue working. This allows for greater security, as well as better power comsumption. You won't have to worry about locking your PC manually or putting it into standby when you leave your workspace. You can get started with Freeze by downloading the free trial. Also check out this video to see Freeze in action.