Here's a list of things that won't happen in 2012, particularly December 21st:
Planetary alignments: There aren't any.
Alignment of Sun with centre of galaxy: Can't happen because the centre of the galaxy is not in the plane of the Earth's orbit.
Once in 26,000 year alignment of the solstice sun and galactic equator: Happened in 1998. Did anything happen as a result? Of course not. Alignments mean nothing in measurable physical terms anyway.
Passing of the Solar System through the galactic central plane: Won't happen for 30 million years or so.
Planet X/Nibiru: Doesn't exist. If it was the size the claimants describe and following the trajectory they indicate, it would now be visible to anybody with a pair of binoculars.
Pole shift: Magnetic pole reversal takes thousands of years and may not start for thousands of years. There is no reason to link it with 2012. As for rotational pole shift, that would take a huge amount of force on the earth. Where is this force going to come from?
Solar storms: The Sun is due to reach a maximum in its 11 year cycle in 2011. No reason to suppose the next peak will be any more energetic than normal.
26,000 year precessional movement of Earth's axis: Doesn't 'begin', 'end' or 'wobble' but carries on smoothly and unnoticed by all.
The doomsday cranks like to tell us that lots of other cultures predicted the end of the world for this date. That and 'predictions' by the Bible, I Ching and Nostradamus have all been contrived to agree wth this date and are all false.