Nice idea,
Hookbill.
There used to be a similar map somewhere on the Downs (there may even be a link back in the mists of this thread), but it only had a limited capacity. So, after a while, every time that someone added themselves, another disappeared. I hope it's not the same with this map.
A question before I add myself, as I plan on moving house soon. Can people edit their details or location once they have added themselves?
Also, I notice that zip codes can be entered for US addresses. I would counsel care in using this facility as I suspect that it may pinpoint locations with rather too much accuracy, given that the US and UK maps zoom down to street name level.
... which, incidentally, reveals that
Hookbill lives in the middle of a river.