After a few months of inactivity, I've now made a large number of changes to this site.
Here's the list:
There is an article describing the origins of the Sharpless, Gum and RCW catalogs.
I've redone the map to update it to include version 2.7 of the Diaz et. al. cluster database (27 October 2006) and corrected the distances of several of the nebulae (more corrections and additions still to come).
I've improved the page that shows the details for each object so that this page shows the full size object image as well if available - not just a thumbnail as before.
My site stats show that Galaxy Map is getting about 1300 visitors a month. Not a huge audience, but I'm happy with the way it is growing.