Okay, I was worried for a moment, but the Google Earth overlay on the same Japanese IDP site worked as well as the Bing overlay and the detail was better. In fact, zooming in on Dunhuang left the historical map in the stratosphere and had breathtaking detail to spare. It is possible to zoom to individual buildings. I'll be looking for the Crescent Moon, the "Singing Sands" Oasis at this level.
It is interesting, however, that the 3D tools are not available in the embedded Google Earth window. They would be on Google Earth itself, but then the overlay may not be available. It would be, however, likely available via a *.kmz save and could be orthorectified fairly easily. So I would stick with Google over Bing at this point. But it is nice to have them both.
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