Its actually BS. If your basing it on the Mayans, the calendar is ending and a new cycle begins for the 5th time. Also, the ancestors of the mayans in peru don't seem worried either. If your basis is on the alignment of the planets to the galactic core, well, that happened back in 1998 and were all still here. Solar flairs? We get them all the time. Worst yet was a blackout, we survived that too. Zombie apocolypse? Not on my watch buddy! So, my advice? Don't go digging your bunker just yet.
The thing that bothers me about 2012 has nothing to do with any Mayan Doom. I believe we could have some sort of major terrorist attack at that time or around that time in the US because of the election that year. An attack can come in many different ways that could send us in to chaos.