we have all the pieces sure,
a simpler short term method could be to allow talk.maemo.org to list members grouped by their location.

qgil and I both have our approx location plumbed into the settings here and I know lots of others do.
it could be enough to know there are 20 active members from our country who might be coerced into a get together.
can make it finer grained as required and with high res data as people see fit?

make a posh map later on once we know the proof of concept works?