You can use this application from http://followyourworld.appspot.com/. It’s a very simple to use tool. Just find a location by searching with the place name. The map will update automatically. Then drag the map so that cross-hair at the centre of the map overlaps your point of interest. Click Select point to fill latitude and longitudes for that location. Submit and you are done. Now the Google team will send you emails each time the imagery is updated in that area.
Note: Google Earth and Maps might not frequently update your selected location and so notifications might take several months or years.
