This could either be an API wishlist, or a fun feature request. Do you have each user's mapped crater coordinates stored and available? If so, we could plot placemarks on Google Earth's Moon view.
As in this example:
You will need the Google Earth plugin installed on your browser. Note, this is not a video. Once the camera zooms to the placemarks, you can use your mouse and pinwheel to zoom and move the moon around.
It might be kind of neat for folks to see where their measured craters are located precisely on the moon. It could even be like a "badge" incentive, the more pins you have on the moon, the more you have to show off how awesome you are.