The IDP maps are impressive. The overlays are integrated into an embedded map window - either Google Maps or Bing's. This is a good evolution over an earlier approach. There is a Rumsey Map collection which houses early maps of London from the mid-1800's. I used them in the 2009 London class in Google Earth itself, but the process was more intricate that it should have been. For those who are interested, check out this link to my London Blog of 2009. It describes the steps for setting up John Snow's cholera map of 1843 on the "pump house" area near what is now Soho London as an overlay in Google Earth itself. A second link provides a "step by step" guide for using the Rumsey map overlay as served through Google Earth. It is very likely that the International Dunhuang Project will do the same thing. I'll keep you posted. This image is an image-save from Google Earth of the Snow map superimposed on London together with some key places associated with that great detective story. (You can read about it in Steven Johnson's great "The Ghost Map.") Here is an entry on the John Snow pump area from that class. It's possible to add GPS tracks to the overlay as well. Here is a London example of that when my class did the John Snow geocache.
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