Using the Yahoo Maps API
Check this out: http://api.maps.yahoo.com/Maps/V1/annotatedMaps?appid=asdfjkl1&xmlsrc=https://idratherbewriting.com/map.xml. Four addresses of my friends appear there. I can include up to 100 or more, I believe.
The address points are stored on an XML file stored on my server. Using a few quick instructions from Yahoo's API kit, I can have those points displayed on the Yahoo Maps. This is what's known as the Yahoo Maps API kit.
Instructions for using the Yahoo Maps API are here: http://tolstoy.com/blog/2005/07/how-to-use-the-yahoo-maps-api-000011.html
Wouldn't it be cool if you could see an entire membership directory where all the members live? Maybe people might object to this -- I'm not sure. But it might increase collaboration and interactivity among members.