Official Google Maps API Blog: KML on Google MapsPosted by Nigel Tao, Software Engineer Strictly speaking, it's not part of the Maps API (yet...), but we have previously announced the ability to show simple KML/KMZ files (as made in Google Earth) in Google Maps, so you can show your own stuff on top of Maps without having to learn any Javascript. For example, you can show crop circle locations as markers, and the Tour de France route as polyline
http://kengo.preston-net.com/archives/002890.shtml
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