This message is to announce the release of version 1.2.0 of the KML Export extension. Although the extension was online for almost a month already, it wasn't announced due to the lack of user documentation.
KML Export is an extension that generates KML files for Google Earth from content in article pages. Users add templates to article pages with geographic coordinates (placemarks) of the subject on the article; the extension provides a special page that scans the articles that contains the placemarks and generates a single KML file, with links leading back to the wiki.
http://www.mediawiki.org/wiki/Extension:KML_Export