They do if you're using Fusion Tables: http://code.google.com/apis/maps/documentation/javascript/overlays.html#FusionTablesHeatmaps http://code.google.com/apis

They do if you're using Fusion Tables: http://code.google.com/apis/maps/documentation/javascript/overlays.html#FusionTablesHeatmaps http://code.google.com/apis/maps/documentation/javascript/ov...