coincidentally, for the first time in 7 years, I almost lost a cheap mobile phone
yesterday in a postal office.

luckily, the worker there was a fair person and she gave it to me.
I keep a software running on my smartphone though that allows me to remotely lock it up by sms and display a message on it like "located by GPS call 0123456".
I guess that changing the logo screen with your contact information would be nice, and in CHDK maybe even have it do something when you start it up that would make a thief discard of it to maybe be found by a fair person. not everybody would know that the software is just loaded on the card.
on bootup it could like simulate a malfunction or it could require some sort of login procedure to work properly (like a key press sequence).
anything that would better the chances of getting the camera back would be useful