To be fair, Fox has mostly opinion shows each hour.
Bill O'Reilly is basically conservative and poses as the everyman, "I'm looking out for you", cut through the spin type of guy. I would be surprised if he didn't vote for Bush.
Hannity and Colmes is a conservative vs. liberal debate show. Hannity is the stronger personality and often sounds like a broken record. Colmes is a weak debater.
Neil Cavuto does a financial news hour but also covers world events and does commentary. He's conservative.
Greta van Susterin is a liberal I think but does a good job of appearing unbiased. She mainly bores us with the events in the latest trial du juor.
Brit Hume does news and discusses the issues with panelists, Charles Krauthammer, Fred Barnes, William Kristol (Conservative)
Mort Kondrake (Moderate Democrat), Ceci Connoly, Maria Liasson, and Juan Williams (Liberal). Brit is conservative.
All of these shows have guests from all political persuasions who argue their points of view. There seems to be a fair mix of opinions.
Overall, Fox News is conservatives attempting to be "fair and balanced" in the guests they bring on and the opinions presented by these guests.
I'm not so sure the old news networks tried very hard to bring opposing points of view to all issues. There is less live debate and more pre produced "nightline" and "60 Minutes" documentaries that are very subtle in their bias.