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The Google Earth COM API is being phased out - Google Earth Blog (blog)
http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNGzBKN1Qxt8xiP-myiP0HFtcMn14A&url=http://www.gearthblog.com/blog/archives/2010/09/the_google_earth_com_api_is_being_p.html