From what I have seen, Fox present the hard line right, nationalistic attitude while CNN has poor general coverage and MSNBC tries desperately to report the opposite of Fox. Fox has journalists further forwards than most with the militaryt as it is known that they will only present a positive image of a situation.

An example. Yesterday, when the tank shot at the hotel and killed the journalists, it became apparent, after a majority of the journalists said so, that there was no sniper in the hotel and yet Fox was the only channel to present the 'silenced sniper' theory put forward by the US. Further reports on other channels seem to agree that the shot was an unintentional mistake and that the tank was in the wrong position when it fired but still Fox neglect to mention any of this and disregard the story after a few hours.

As a side note, CNN were banned by the Saddam regime becuase they broadcasted a peice that had not been screened by the journalist's censors. If anything, this suggests that CNN are trying desperately to present an unbiased opinion.