Also, near-Earth asteroid trackers get some press in the Washington Post. (http://www.washingtonpost.com/wp-dyn/articles/A38306-2005Apr8.html) They mention the slightly scary case of 2004 MN4. It's important to keep these things in perspective, though: at the time I tried to figure out what a 2029 impact of 2004 MN4 would be like, and the answer I came up with was "roughly comparable to the tsunami that just happened while you were worrying about asteroids".