I'd like to comment, but I don't understand the markup on the image.

you might be interested in the familiar stranger or activity inferencing research at intel:

berkeley.intel-research.net/paul...nger/

and

seattleweb.intel-research.net/pro...ity/

Very interesting. I had not heard of the "Familiar Stranger". I think it is the kind of thing that should be on the Calresco site. www.calresco.org/

But to me, this looks a little weak (to say the least) as a motivating scenario for a such a device:
Scenario 2: Office worker is tired of going to the same places for lunch after working at company for many years - he uses his handy FS gadget to help him get away from those places typically frequented by people where he works.

It's like a neat idea in search of an application.

Although interesting, I also find it all part of our seemingly inevitable "tracked" future.

An alternative implemenation of the little "Familiar Stranger" device described on the Berkeley web site ( berkeley.intel-research.net/paul...nger/ ) might be one where you pay a subscription for a F-S service. The service would be provided by the Microsoft-Time-Warner-Haliburton-News-International Corporation.

The service works like this: Everyone has these little RFID-type biochips implanted at birth. The computers at MTWHNI Corporation track everyone. This little subscription service that you can buy from them sends little messages from their computers directly to your implanted biochip that inform you when you are near someone that MTWHNI Corp has registered as one of your Familiar Strangers. You get a little electrical shock of varying magnitude, depending on how familiar the stranger is and depending on how many familiar strangers there are nearby. You can if you like have an item of jewlery or stick-on patch that contains a light or piezo buzzer that connects to your biochip to give that extra visual or audio alert.