According to NASA the LCROSS mission was designed to search for water on the moon. The LCROSS mission is going to accomplish this by sending a rocket into the moon causing a huge blast and impact creating a crater, throwing tons of potentially water ice and vapor above the lunar surface.
To get a better idea about the project download and watch the mission overview here:
Youtube: NASA LCROSS IMPACT
Tips and Tricks
How To get the live feed and streaming video from NASA:
Open your Windows Media Player and press CTR+u
Paste the link below:
NASA Public Channel