Property law is a rather tangled web here on Earth, so imagine the difficulties associated with land and resource rights on the moon. The Wall Street Journal Law Blog has a very interesting entry on moon rights today. With the recent discovery of water on the moon, it becomes more likely that humanity will hasten its exploration of the moon. So how will ownership of the moon be decided? There were a few treaties made back when moon exploration was at its height, but it is still difficult to say who can claim ownership and how. For more look at this older but still interesting article in Popular Mechanics. To buy your own little chunk of the moon, try the Lunar Embassy.