I met Mika Raento at the PLAN workshop and I loved his application ContextFlickr immediately – it finds information near your phone – like bluetooth device ids, cellids and GPS coordinates if you have a bluetooth GPS like me (since yesterday 
and uploads them with your picture to flickr, as tags. So you get a lot of cool ways of grouping your photos, automatic GPS tags for use with geobloggers, georss and WorldKit etc.
Anyway, he’s got a shiny new version called “Merkitys-Meaning”. It works lovely. And (like Shozu) saves you money if you’re an inveterate moblogger like me and were previously using MMS. It’s GPLed. It’s ace. Try it!
p.s. tripletags!
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With all of this information available, maybe it’s time to start thinking of adding a term to FOAF (or other vocabular) for mapping a bluetooth ID to a person.
BlueFOAF already does something like this, using http://usefulinc.com/ns/bluetooth/bdaddr, but the term isn’t defined anywhere…
There’s also http://jibbering.com/vocabs/bluetooth#address_sha1sum – but of course that’s a 404…