We're definitely hurtling towards doom, but take heart: At least the world isn't going to end for a stupid reason like "Mayan prophecy." It will end for a totally smart reason like "perfectly able-bodied people unwilling to quit driving two blocks to the gym."
For the past few years, there's been a persistent meme that 2012 is the last year ever, because it's the last year on the Mayan calendar. Of course, nobody seriously believed this except for people who panic every time their wall calendar runs out ("oh god, there are no more months past December!") -- at least, that's what I've been telling myself to avoid a despair spiral. But sheer idiocy has never been sufficient to keep an idea from getting all up in popular culture, so "2012 is the end of the world" joined things like "the government is hoarding secret aliens" in the pantheon of complete BS that still gets made into movies.
Except as it turns out, 2012 isn't the last year on the Mayan calendar at all -- it's just the last year on the calendar we happened to be looking at. Boston University archaeologist William Saturno and his team has found an amazing trove of millennium-old art in Guatemala, including tables showing at least 7,000 years of future astronomical calculations.