There's a new eye on the skies on the lookout for 'killer' asteroids and comets. The first Pan-STARRS (Panoramic Survey Telescope & Rapid Response System) telescope, PS1, is fully operational, ready to map large portions of the sky nightly, making it an efficient sleuth for not just potential incoming space rocks, but also supernovae and other variable objects
http://www.universetoday.com/2010/06/16/fully-functional-pan-starrs-is-now-panning-for-stars-asteroids-and-comets/-- you should look at the article just to see the fantastic picture of that telescope above the clouds... why did I become a radio astronomer again!!