<script type="text/javascript" src="http://google.com/jsapi"></script>
<script>
var map;
google.load("maps", "3", {"callback" : mapsLoaded, "other_params" : "sensor=false"});
function mapsLoaded() {
var myOptions = {
zoom: 5,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
}
</script>
А еще у Гугла можно KML (KMZ) грузить, вместо xml:
var markersKML = new google.maps.KmlLayer('http://your-site.com/points.kmz', {'map' : map, preserveViewport : true });
