Just to remind myself how to capture the event when the map is dragged AND work out the distance to a previously recorded center point on the map
GEvent.addListener(gmapFn.mapObj,'dragend',function(){
var ctrLatLng = gmapFn.mapObj.getCenter();
alert(ctrLatLng.distanceFrom(gmapFn.lastRefLatLng));
});
Very handy! gmapFn.mapObj = the object of the instianted gmap object and gmapFn.lastRefLatLng is a GLatLng. You can quickly get the center of a google map by calling the function gmapObject.getCenter() which returns the center as a GLatLng.
Enjoy!
Update : handy refrence of all the events you can to a google maps listener http://econym.org.uk/gmap/gevent.htm
