That last post from pianistimo is more to do with global warming....
The pole shift is something to do with a change of magnetic field, not actually an axis changing or anything like that. Some studies say that the magnetic pole (north pole today) changes about every 10000 years, and last time it happened was about that amount of time ago, therefore soon it should change again. That would mean us not being able to use a compass in boy scouts or brownies clubs any more, what a pity, we'll have to resort to GPS routers....
There have been a large number of "signs" in crop circle mysteries over the last few decades, which all indicate that something major should happen on 12/12/2012. I think some people like mixing up science and some wild-fangled theories which no doubt have some sort of proof basis, since these crop circles are actually impossible to do for any normal human, and appeared in many cases in less than 30 minutes, the most famous one near stonehenge where visitors would have seen anything happening.
Of course other Jehova's witnesses might claim it is yet another proof of te approaching apocalypse, and that will happen on the above mentioned date.
I'm curious to see whether anything will actually happen on that day, apart from hundreds of millions of people going to do mindless christmas shopping...
and I don't quite get how you go from a polar change to the fact that it should have happened when christ died... Maybe when the polarity of the magnetic field changes/the apocalypse comes/some unknown thing happens is the day when christ comes back, but for the moment it's a load of codswallop of a mixture of hard science and silly speculation in my view.
It is really rather annoying when people get things mixed up!!!!