Lots of people have been talking about it so here are the facts.
NASA scientists have recently discovered what they believe to be water molecules. They are on the north and south of the moon, which are actually ice caps. They are much to cold for anyone to go to, and for some reason no rovers were put on the moon that found this. So the moon is going to be hit by (NOT A MISSLE) a capsule which is being propelled and protected by a satellite. When the capsule hits the ice, the ice should shatter and send fragments down to earth. The scientists hope to find water molecules, because it wont come down as rain it will heat in the atmosphere and evaporate. If this is true, a moon-base station is quite possible.
Oxygen can be made from urine, (as gross as it is) it uses the water in the urine and splits the molecules to make oxygen. Water is a large portion of what is brought on trips through space, because it is so vital. If water is on the moon, it would allow longer trips because the astronauts can just drink the water from the melted ice. Also because the space that was used for water can now be used for food.
Either that or the scientists are like "Man we haven't blown stuff up in a while. Lets bomb the loving moon."
Edit: Randomguy had a good description too.
I had read about this last night. They're launching a "Lunar Crater Observation and Sensing Satellite" (otherwise known as LCROSS, abbreviations are so much fun). They're going to launch two parts of the LCROSS at the moon at approximately 6,000 miles per hour, sending up 6.2 mile high plumes of moon dust. First it will drop the booster rocket, blasting a hole about 90 feet deep. After the LCROSS brown townyzes that plume, it will launch itself at the moon, creating a second 60 foot deep hole.
Isn't science fun?