I think it's all rubbish. People have been working themselves into a panic over every little "doomsday" prediction for years.
Do I think the world will end? Meh...I'm a Christian, so yeah, I believe in the whole Revelations thing but I don't think it's going to be in 2012. My mother is big into the "signs" and she's positive that it's getting close. *shrug* Not getting into religion here, but I'm ready to go when ever the horn blows and it's time. Personally, I say live each day like it's your last. Then it won't matter if something happens today, tomorrow, or 2012. Live your life to the fullest and have no regrets.
