And now in addition to Google Mars which was already included, Google has added Google Moon. It's included with Google Earth 5.0 and as always is free. You can download it here.
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Google went beyond a simple atlas and managed to integrate recent data captured by Japanese spacecraft Kaguya including some very high resolution video footage captured as it orbited the moon for 20 months.I think if you love maps, satellite photos, atlases and other visual references to our spatial environment you cannot be without Google Earth-Moon-Mars.There's also vast quantities of high resolution panoramic pictures taken from the moon as well as freshly released video footage of the moon from NASA, making it more of an encyclopedia rather than merely an atlas.