Hum,
Nice link there...
And in the news...
Near Earth Object Observation Program experts have told the Senate subcommittee on Science, Technology and Space, that they are on schedule to finding everything bigger than 1 kilometer (0.62 mile) in diameter that might approach the planet (that`s city killers).
"The survey officially started in 1998 and to date more than 700 objects of an estimated population of about 1,100 have been discovered, so the effort is now believed to be over 70 percent complete and well on the way to meeting its objective by 2008."
So things don`t looks so bleak... :-)