Google Moon is the mapping source one needs when exploring the moon. Google has several layers that allow one to quickly view in detail the eighth continent. Not only is there the standard lunar map, but there is also an "Apollo" layer which has up close imagery with annotations. What really makes Google Moon great though are the charts. The charts not only have elevation data but also enough selenographic (geographic) background data to make any geek do a lunar jump of joy.
Later today Google will announce something big to celebrate the anniversary of the moon landing. It will probably be integration of Google Moon into Google Earth (like they did with Google Mars). Catholicgauze will keep you all up to date with the latest information.