In honor of the first manned Moon landing, which took place on July 20, 1969, Google added some NASA imagery to the Maps interface -- check out their use of Google Maps technology on Google Moon.
And they have a sense of humor – check out their job posting for their lunar location called Google Copernicus Center.
Update: It's looks like Google's sense of humor is getting more cheesy -- zoom in all the way on the moon image to find out why.
Update 2: We're also playing with a Google Map of Miami, Florida. We're plotting local restaurants, hotels, and real estate. The Miami Map is in beta. The official launch is August 3, 2005.