In the US, we use the Gregorian calendar: 12 months every year and usually one full moon per a month, since the lunar cycle does not fit into the solar year. Periodically, there will be a blue moon. A blue moon occurs as the second full moon when there are two full moons in a month. On the other hand, the lunisolar calendar, such as the Chinese calendar, follows the lunar cycle for months and sun for years. So there are occasionally 13 months in a year instead of 12 months in a year because there is always one full moon per a month. So the Blue Moon phenomenon experienced this past friday, August 31st, 2012, does not happen in the lunisolar calendar.
So basically that blue moon everyone on the interweb was taking pictures of is just as beautiful as the last and next full moon. =]
(I was talking about this with my mom yesterday, and suddenly everything clicked as to why occasionally a month will repeat in the Chinese calendar.)