This is such BS
The Mayans NEVER stated that the world would end on 12/21/2012. Their calender stops simply because it is the last day of the 5,125-year-long cycle in the Mesoamerican Long Count calendar.
Even if they HAD stated that, why in the world would we put so much stock in the opinion of an ancient tribe- because they were good at math?? We're much more advanced at math and astronomy than they were, but to my knowledge we can't predict the future, either. Undoubtedly, the dimmest and most gullible amongst us will panic and do irrational things to "prepare" for this non-event, much like they did when a radio host (!) predicted the end of the world several times.
Man, theres one born every minute!