Meh. If you talk to anyone who is actually legitimate (NASA scientists, anthropologists [who study Mayans], etc.) none of them will spout this kind of nonsense. I think I'll trust NASA over these people.
(Why NASA scientists say the world will not end in 2012 due to a polar switch or any other anomaly)
(Why the world will not end like the Mayan calendar)
(Other times people said the world would end and it didn't)