Definition: Google Moon uses the Google Maps interface to show satellite images from the moon. The Apollo lunar landing sites are marked, along with some information about when they occured.
When Google Moon was originally created, it was tied to an April Fool's Day joke. Zooming to the maximum magnification on the moon's surface revealed a picture of cheese.
Since then, Google became the sponsor of the Google Lunar X Prize for landing a privately-funded vehicle on the moon. They've upgraded the interface for Google Moon and replaced the original low-quality images as better photos became available.
Google Moon is available on the Web at moon.google.com
