You have heard the expression "once in a blue moon". On December 31 I learned where this originates from. On rare occasions there are two full moons in one month. Did you know this happened on New Years Eve? There was a full moon on December 2 and on the 31. This doesn't happen very often - the next one won't happen until August 2012. Hence the expression "once in a blue moon"!
There was also a partial eclipse that night. I didn't get a picture of it though. It didn't last very long.