Google Maps allows you to plug in an address and get the location displayed on the map. But what Google Maps does not allow you to do is click on a location on the map and get the address of that location. The first is an example of forward geo-coding. The later is an example of reverse geo-coding.
I needed a tool that would allow me to quickly navigate to a location of a know address (forward geo-coding) and then display the addresses of different locations on the map (reverse geo-coding). So using Google Map API examples, I quickly created this very simple tool which will allow you to do this. Check it out at: http://www.aggregatedintelligence.com/googlemaps/reverseGeoCode.html.