From the AP story on Yahoo! News:

On a winter day when bomb blasts at an Iraqi university killed dozens and the United Nations estimated that 34,000 civilians in Iraq had died in 2006, MSNBC spent nearly nine minutes on the stories during the 1 p.m. hour. A CNN correspondent in Iraq did a three-minute report about the bombings.

Neither story merited a mention on Fox News Channel that hour.

That wasn't unusual. Fox spent half as much time covering the Iraq war than MSNBC during the first three months of the year, and considerably less than CNN, according to the Project for Excellence in Journalism.

The difference was more stark during daytime news hours than in prime-time opinion shows. The Iraq war occupied 20 percent of CNN's daytime news hole and 18 percent of MSNBC's. On Fox, the war was talked about only 6 percent of the time.

The independent think tank's report freshens a debate over whether ideology drives news agendas, and it comes at a delicate time for Fox. Top Democratic presidential candidates have refused to appear at debates sponsored by Fox. Liberals find attacking Fox is a way to fire up their base. ...

So with less on-air attention being paid to Iraq during the first few months of the year, what filled the void for Fox? PEJ's report said the network gave the death of Anna Nicole Smith significantly more air time than its rivals.

Here's the PEJ report on cable news.

And here's the home page of the PEJ News Coverage Index.