Jean Thie used the extensive imagery in Google Earth of Canada’s northernmost parts to check in on old research sites from 30 years ago. He points to examples of where permafrost is melting, in the process explaining those strange holes you often see up there. Fascinating stuff.
How has something like this stayed under the radar so long? Ashley Joyce’s GE Chess. You play against others online, make your moves in the browser, and then see the resulting game develop on a big 3D chessboard in Google Earth. Windows only, though. I also wish it would be possible to get network links for games in progress, so we can watch along.