https://github.com/jawj/OverlappingMarkerSpiderfier

• google
• maps
• googlemaps
• marker
• spider

http://groups.google.com/group/google-chart-api/web/chart-types-for-map-pins

• google
• map
• marker
• icon
• charts

http://www.powerhut.co.uk/googlemaps/custom_markers.php

• google
• marker
• map
• icon