It is a Myth and false prophecy to say that the Mayans Predicted the end of the world.  Their long count calendar simply ended one cycle and we have entered a new cycle.  Saying that the world would end on December 21 2012 is like someone from the future finding one of our Calendars (that just happened to be printed for their year) saying the world would end on December 31 that year!!

Just because a Calendar ends does NOT mean the end of civilisation or the world as we know it.  It does however mean the end of a cycle.