NASA Goddard Scientific Visualization Studio has put together a wonderful 2+ minute movie about the formation of the Moon. I highly recommend that you tune in and watch how our closest neighbor in the sky became what it is today. You can also do 3D if you want.
Check it Out: http://svs.gsfc.nasa.gov/vis/a010000/a010900/a010930/
There are also other great movies from this same Studio that you can download and see here:
Sky Guy - Moon Lover for Ever - in VA