What features of KML & GeoRSS are supported in the Google Maps Javascript API?
The GGeoXML class in the Javascript API enables developers to overlay KML/KMZ and GeoRSS files on top of the map. Examples are here. The KML features currently supported by the GGeoXML class are documented at: http://code.google.com/apis/kml/documentation/mapsSupport.html Support for additional geospatial features may be added to the GGeoXml class in the future. Check back here or stay tuned to the Google Geo Developers blog for updated information.