GLatLng is the API's basic location object, it's a 'thing' not a
function.  It does come with built-in methods to operate on the
location, such as .distanceFrom()

geocoder.getLatLng() is method that returns you some data, that data
is ready-structured as a GLatLng object for you by the API.
As a GLatLng object, it has the distanceFrom() method built-in.

Note that return of the data is asynchronous because of the round-trip
to Google and back.
   http://econym.org.uk/gmap/async.htm
Note that if you have only one geocoder object, and start re-using it
before the previous result comes back, things will go wrong.

Some structure like this should work (untested) -
         geocoder.getLatLng(from,function(from_gl) {
                if (!from_gl) {
                        alert(from + " not found");
                    }
                    else {
                                geocoder.getLatLng(to,function(to_gl)
{
                                       if (!to_gl) {
                                              alert(to + " not
found");
                                       }
                                       else {
                                              alert(to_gl.distanceFrom
(from_gl));
                                       }
                               }
                }
      }


As soon as you do more than one geocode at a time, you may run into
the issues described here -
   http://econym.org.uk/gmap/geomulti.htm

Error checking any geocode request is probably a good idea
  http://econym.org.uk/gmap/geo.htm
but that would preclude simple use of geocoder.getLatLng

cheers, Ross K
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