- Planes: 3D flight tracking with Google Earth for a few US airports (LAX, BOS, ORD, ATL and JFK)
- Trains: DartMaps is a very cool mashup of Google Maps and real-time rail times. You can really see the trains moving!
- Automobiles: Traffic jams in cities all over the world with Google Earth. Or parking availability in San Francisco on Google Maps.
Update: a blog with more cool google maps.
Update: Google Earth as a platform for OA geospatial data, scientific data mapped to Google Earth facilitates science reaching the public.