Terry Heaton has some good cautionary words for news organizations that are jumping into podcasting (Podcasting's Allure to Broadcasters):

So to television stations who are considering (or doing) this, I offer two pieces of advice. One, don't expect a great return, if all you're going to do with this is repurpose TV news or TV news segments. Original or expanded coverage is much more likely to be compelling to podcast users. Secondly, don't let this fool you into thinking you've entered the new media/multimedia world. You haven't. Just like your portal website, all you've done is find another way to do the same thing you already do. Repurposed content — regardless of the venue — is just same-o, same-o.