Assuming that this is an API question:

You can use EGeoXml to process multiple KML files at once. Pass it an 
array containing the URLs of the individual MyMaps KMLs. And EGeoXml 
does have a {sortbyname:true} option for the sidebar.

The next problem is that a map with 500 locations is going to be rather 
sluggish in most browser environments.

-- 
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team


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