For those of you interested in images from satellites, NASA has just updated their ASTER image data base. ASTER has been photographing hundreds of locations around the world from cities through to river delta and forests.
This one example is of the volcano on the island of Cape Verde, various resolutions are available if you wish. It might not be as interactive as Google Earth, but you can learn a lot about the world resources from these images. Enjoy!
Beasley's Place 