As far back as 2004 I mentioned the asteroid Apophis. Most recently in 2009. Now in 2013 it’s back in the news. It’s bigger (“1,066 foot (325 meters), with a margin of error of ±49 feet (±15 meters)”), and will pass closer than the orbits of some geostationary satellites. Possibly even taking a few out on its flyby.
Curious what we’ll learn in the next few years as astronomers gather more data and crunch more numbers.