Well, hats off to Deep Impact, which made its rendezvous with a comet and hit it dead-on. Worldchanging.com has a photo and article that also talks about the long-term planetary defense implications re: comets and asteroids. An old Transterrestrial Musings post talks about some of the interim steps to that goal, including a change in space policy.
Meanwhile, there are organizations working on the whole issue of NEOs, or Near-Earth Objects:
* The Spaceguard Foundation
* Spaceguard UK has the CAIN project
* B612 Foundation, a 501c3 organization. (July 26/05) They've just made a very worthwhile contribution.
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