NOTE: The astronomer Philip Plait has stated very clearly that the Mayan calendar does not end in 2012 at all, that it is like the odometer on your car, as each section of the odometer reaches 9 and then clicks over to 0, the next number to it starts a new cycle, so that when all the numbers again reach 0 all the way across the odometer - the last number will change from 1 to 2 and the new cycle starts all over again.
Fun reading:
http://www.greatdreams.com/2012.htm