Quora answer: Will the world end in 2012, as per the Mayan prophecy?
By the way everyone thinking about this question should read Invisible Landscape by Terrance Mekena and his brother, because at least in their Mayan Calendar scenario the world ends due to the transformation of consciousness to higher and higher planes which is an interesting possibility:
http://darrensangita.blogspot.com/2011/05/invisible-landscape.html
http://technoccult.net/archives/2010/05/06/dennis-and-terrence-mckenna/
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http://www.quora.com/Will-the-world-end-in-2012-as-per-the-Mayan-prophecy