NASA TV has begun their broadcast of the Deep Impact mission
http://www.nasa.gov/mission_pages/d...main/index.html

It's live via the net, too:
http://www.nasa.gov/multimedia/nasatv/index.html


Big Metal battering ram of a probe ramming into a comet live. Sweet.

T-Minus 10 minutes and counting.
Update:

.. and they hit it pretty good. Pow! Right in the kisser!