There's no need to worry folks. I wish the people who made these scare-mongering websites would take the time to do some true research.
The Mayan calendar is not linear like ours is, it is circular. Therefore the calendar cycles. I believe this will be the third time this calendar has cycled, and the world has not ended yet.
Basically, it is a complete misinterpretation of the calendar cycle. Mayan experts (as in people who are from the Mayan lineage) have said that it does not mean the end of the world. Even the Mayan people way back when did not interpret it that way.
When the calendar cycles, they did believe there would be some fundamental change in civilization. I don't know if it was supposed to occur on the day of the cycle, but I suspect not. One could argue that with advancing technology that we are already seeing this shift as we approach the end of the cycle. After all, the cycle is at least a thousand years long, so in the scheme of things five or ten years could be seen as the end of the cycle.