The AP asks if a "backlash loom[s] against opinion news." It has a good run down of recent challenges to the media practice, including John Stewart's appearance on Crossfire, David Westin's Harvard University speech, some of Michael Kinsley's recent writing, and the work of the Project for Excellence in Journalism. I would add John Carrol's May broadside against pseudo-journalism, the creation of mediamatters.org and the publication of Brock's Republican Noise Machine, the publication of Mooney's CJR article on science reporting, and much of the work at Columbia Journalism Review's Campaign Desk.
I wasn't familiar with the Oct. speech by ABC News President David Westin. It is reported in the Harvard Crimson.