Have people use lat/lng?  You can add two new columns for latitude and longitude populated by:<p><pre><code>  =GoogleLookup("address to geocode", "latitude")
</code></pre>
"Address to geocode" can probably be made using the existing city/country columns.<p>Then you can automatically make a map directly from spreadsheet data: <a href="http://gmaps-samples.googlecode.com/svn/trunk/spreadsheetsmapwizard/makecustommap.htm" rel="nofollow">http://gmaps-samples.googlecode.com/svn/trunk/spreadsheetsma...</a>