This is not exactly on topic but very close. I would like ot see a world map of my caches with a dot where everyone who found it is from. Geocaching.com should have the coordinates of every user, so it should be possible to figure it out quite easily. I suppose a couple of extensions would be to be able to see where everyone who visited any cache was from . Another idea would be to dump the coordinates out to Google Earth so I could travel around the world looking at where everyone is from. If confidentiality is an issue, just track the degrees and not the minutes for a more general map.