I ought to update my Top Trump card as my spotability score has increased and my Copenhagenalismness score has plummeted. That said,
…any interest in collating these together in a single location, to make it easy to find them, and also to make it easy for other people to add their details…
There are any number of Google-based (or even Frappr-based!) maps with drawing pins signifying who's where and who's doing what. They all have a bunch of early adopters then a bunch of secondary adopters, and a few dog-on-a-string stragglers later on. After a year or two people take a dislike to telling the world where they live and what treasures they have, and delete or vagueify their details. And that's just the ones not hosted elsewhere on Flickr or FriendFace or Strava or Twitter or in a forum's sticky discussion.
PY is a bit more like 'the old days', where you waited each month for a newsletter or something, and went along to an event to meet other likeminded people. Part of the fun is finding out who turns up. No-one automatically knew about everyone else in advance.