It's being reported on the broadcast networks, but the only web link I could find was Bombing hits Iraq TV; Goes off air:
Iraqi state television and another channel run by President Saddam Hussein's son were knocked off the air on Tuesday evening by coalition air raids on Baghdad, TV sources told AFP.I've seen 15 reasons why it had not been hit previously, none of which I gave a fig for.
UPDATE: CBS is claiming it got hit with an E-Bomb but a somewhat weaker signal returned several hours later.