Jonas Witt just released version 0.9 of his combined bluetooth/wifi scanner software that allows you to set triggers on your mac for predifend ‘zones’. Each zone is represented by either a Bluetooth device (your mobile phone for instance) or an Airport network. It still lacks a bit in definable actions but pretty cool nonetheless. I hope this becomes a scriptable app that would really allow some great functionality.

Check out some of the other quality releases by Jonas too, this guy is on a roll.