WHY?
Often I travel by ship / train long for many hours. Often I sleep. Every time I am afraid of my bag, someone could steal it as I sleep.
POSIBLE SOLUTION?
It would be awsome if I could put my bluetooth handsfree in my bag and have my n900 in my pocket. n900 could run an application that checks every 2 - 3 seconds BlueTooth signal strength ( maybe could be configurable range ) and if the strength gets low or none, then n900 will alarm loudly / vibrate.
I hope my idea was clean. And since I don't know much about programming ( only php :( ) I hope someone will find intresting my idea and make it!