If I am not mistaken... I think everyone's placing bets on the world ending on December 21, 2012. Where did I pull such a date? Dispite what many are going to think... it wasn't out of my bum.
http://www.wikipedia.org/wiki/Mayan_calendar
The Mayan calender happens to end on this day. Kinda makes you wonder what exactly they were counting down to. Some people think its a polar shift (some version of north goes south and south goes north). Or it could be the start of the last ice age... or a number of things.
One of my friends (I don't know where to go to reference this so help me out if you can!) this guy thinks that there's a planet which all of our "gods" came from that will be very close to earth by this day.... eh... I think it will be just another day if you ask me XD
*edit* The mayan info I provided was kinda wrong, not the end of the world but the end of a long count falls in this year. Its kinda complicated there calender system... and the website provided definitely explains it better than I could!! XD