December 21st, 2012 - the day I move my fishtank upstairs maybe probably not.
In all reality, even if there was 100% proof that the world was gonna end I'd probably still be on my computer,takin care of my fish, and living my normal life. Then visit family on the last day. You may think that boring or stupid, but honestly, what would you do? Visit the Grand Canyon? Congrats, you've seen the worlds largest dry pit with a river. Whup, it's gone now. The last day alive is best spent with family.
As for Niburu, or other celestial threats, the potential always exists for a blind spot, so I won't rule out impacts of some type, but I also don't think it any more likely that day then any other day. Same with most/all other disasters that people proclaim will occur, they could happen today, tomorrow, next week, or next year. Why should I be especially worried?
Edit:
http://www.18seven.com/?p=7605
This says, and I quote "the Sun and the earth will align for the first time". This makes me laugh so much :rofl:When you have two objects they are always aligned - always. If it was three objects, I would be able to put more then just laughter into this, but it's not, so I can't. :lol: