From all indications, the Deep Impact mission was a great success. The projectile part of the ship hit the comet and the observer part was in position to watch the fun. Check out the images at http://www.nasa.gov/mission_pages/deepimpact/main/index.html
Congrats to the team!!
This is absolutely amazing to me. The sheer speed and room for error in this mission should place it in the list of man’s greatest scientific accomplishments.