You could maybe make the map so that people have the option of doing it anonymously, or showing who they are (user name). That way everyone could participate even if they didn't want people to know where exactly they are.
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Zip code won't work for me since I don't live in the states. There are a few of us (not many in comparison to the states) that live in other countries that don't use the zip codes.
Anybody know how to use the Google Maps or Google Earth API? We could setup a form in Google Docs and have the data sync with Google maps. Maybe we could even use the current location system already part of member profiles.