Russians are making tentative plans to 'deflect' an asteroid, 99942 Apophis (estimated to be 3 times larger than the famous 1908 Tunguska meteorite), headed toward earth on a 20-year timetable. I don't expect to still be around at that point, so not too concerned about it, but for those who are, read all about it:
http://www.nytimes.com/2009/12/31/world/europe/31asteroid.html?_r=1&partner=rss&