Usually Fox News, as my husband has it on all day. I like listening to Neil Cavuto, Sheperd Smith, and Glenn Beck, but Cavuto is my favorite. I also like Britt Hume when he's on and Charles Krauthammer.
Mark also likes to listen to talk radio. My favorite of the radio talk show hosts is Michael Medved. It used to be Tony Snow. Snow was a brilliant writer and newsman, and I feel his loss keenly.
I also liked David Brinkley very much, and I like George Will.
And for purely intellectual stuff? Brian Lamb is my god. :)