The world hasn't ended on December 21, 2012, so far. But that's not to say it's not going to end sometime today.In case you want to be one of the first to know when the planet is scorched by the fires of doom, or you want to check from time to time whether the planet is still there, NASA is providing a non-stop live stream of our planet from the ISS.
Granted, it's only a small portion of our planet that's visible, but if there something happening down there that would trigger the end days, it's probably going to show up.
In the meantime, you can listen to the communications between the ISS and the ground crew. Currently, if you speak Russian, you can follow along with the docking procedures of the Soyuz which is bringing three new astronauts to the International Space Station.