The Mayan calendar is going to end. But that really doesn't mean Earth is going to explode or anything. Had the Mayans still been around, they would just have started a new calendar. Our calendar ends on the 31st of December, but no one expects the world to end on that day.
The way I see it, what is meant by the end of the world, is that we are going into a new spiritual age. The world is changing, and not for the worse. (cos frankly it can hardy get any worse)
I really can't stand the medias that promote that silly idea that the world will end in a week. There are people who get really really scared, and it's not fair, cos it's all a lot of b*******!