I've added some addition functionality to the LatLong form tool that:

Shows your marker on a map.
Updates the map if you change the lat. and long. text box
Allows you to move the marker around the map to change the location's lat. and long.
Contains utility links that: find your marker if you have panned away from it and; changes the location to the centre of the map if you have panned to a new area where you would like the marker moved.

PLEASE NOTE (as with Andrew's http://bugs.farcrycms.org:8080/browse/GM-2) you need an additional Google Map API key. If you do not set up this key the map will not be visible.