I have made some good progress toward an alpha build of the application. This application called handyLock will allow you to lock your Mac screen if you move away from it. Essentially a proximity based lock screen. Similar to using a physical keycard to lock or unlock a door in the office… but using hardware you already own… a Mac and a Bluetooth phone/tablet (iPhone, Android, Blackberry, iPad, etc).
I will be looking for testers for the application. If you are interested you will be able to download it and provide feedback so I can get to a polished implementation.
The 1st version will implement a basic set of features:
- Associate 1 Bluetooth device with your Mac
- Tune sensitivity to trigger the screen lock closer of farther from the Mac
- Unlock the screen via a password in case your Bluetooth device is dead or out of range and you need to unlock your Mac.
I also need to create icons for the application. Will probably look ugly for the alpha 
The nice thing is that the application will allow for a 14 days trial before requiring a small donation if you want to keep using it. This way you don’t end up spending $ on something that might not work.