Kaboom...

Not bad for a little satellite collision. Ever wonder if those NASA brats were just doing this mission just for an excuse to play cosmic bumper cars? I mean finding out what the early solar system is made of is nice - but blowing up a comet is just friggin neat.

Addendum:
Via Spaceflightnow:

"It's considerably brighter, there's considerably more material coming off than I thought," Yeomans said, watching the initial impact images come in. "The predictions on the science team were all over the map. Someone won a fairly large-size pool here with a long-shot prediction of a rather extraordinary impact.

"We've got an object the size of a washing machine going in here creating a crater and ejecta that's just enormous. At least that's the way it looks like now. ... One of our science team members actually predicted the impact would release sub-surface pressure and we'd have a far bigger explosion than they anticipated. That may be what happened, I don't know."

Whoever that lone scientist was he deserves a beer. Of course it could have been a lucky guess. The explosion may have been larger because of other factors - like say a material on the comet surface previously unknown that acted as fuel... Either way he must be happy.

That being said the biggest use I can see coming from this mission won't come from the science - it'll come from monitoring the collision. This type of information could prove critical if ever we find ourselves staring down this or any other comets path in the future.