On May 31st we'll have our first blue moon since August 2005.
Blue moons happen infrequently, hence the term "once in a blue moon".
The modern definition of a blue moon is the second full moon in a calendar month. Normally there are 12 full moons every year -- one every month. However, because the moon cycle is slightly different than the monthly calendar cycle, occasionally there are two full moons in one month.
Blue moons happen approximately once every 2.7 years. The next blue moon will be December 2009.
You can see the 2 full moons on Lottery Post's Lunar Calendar: http://www.lotterypost.com/lunar-calendar.aspx
So, is anyone putting any strategies into play based upon the rare lunar event?