There were many people concerned because the Mayan calendar ends on December 21, 2012. The end of the world was predicted by many (probably some of the same people that prophesied about Y2K). Then there were a couple of things that happened to strengthen the apocalyptic threat.
First, Dick Clark died in April. Without Dick Clark, can we usher in a new year? Secondly, Hostess filed for bankruptcy protection. Hostess makes Twinkies, the only food that could survive an apocalypse.
All that worrying and hand-wrnging has come to naught. I'll bet this is why the Mayan calendar ended at December 12,2012:
6 years ago