What's the matter with Kansas?
Google's new Lat Long Blog is providing a kml file specifying ground overlays for recently acquired satellite imagery for Greensburg, Kansas, before the tornado and afterwards.
This is a sampling, before and after:
As superlative as the rhetoric has been in describing this scene, with some claiming that Greensburg had been wiped off the map, it is now obvious that this is exactly what happened. Utter devastation.