I just want to reiterate that I have not made up my mind on what, if anything, may happen in 2012. The links I gave were just to give some examples of theories out there. There are way too many to list. I usually look up the source of each story to determine what, if any weight I want to give to it.
I just find it interesting that so many different sides (science/religion/spiritualists) believe that something will happen in 2012 or consider it a significant year. In my life, as I'm sure all of you have; I have heard that the world will end in my lifetime. So many times, so many predictions, and thankfully nothing. Out of all of the dates that have shown up and all of the end of time/cataclysm/major change theories, for some reason, this is the only one that concerns me....