The Mayan calender thing? which would end in 2012? They miscalculated it. Someone found out the calender ends in 2232. But You should know that it is based on a cosmic event, in which the sun and an object, far out in space, are in one line with each other. The calender ends(in 2232) with such an event. But nothing weird will happen, according to physics anyway. But we haven't experienced it, so we can't know... Oh wait, WE haven't experienced it, But people from 100/200 years ago did! Wat happened? Nothing.
Also, the Maya people didn't really believe in an 'end' of time. Rather, they believed something great would come to them. So even if the Maya were right(and I don't say they were), and something would happen in 2232, We would be granted some sort of wisdom. I don't know exactly. But an apocalypse at the very least.