Weight Loss Support - Your favorite fitness podcasts?

I have a long roadtrip coming up, so I'm looking for podcasts to listen to to pass the hours. I've already subscribed to Jillian Michael's podcasts, but they seem to be a lot of "talk" without a whole lot of info. What are your favorite, informative, healthy-living/fitness related podcasts?

http://www.twofitchicks.org/

I'm listening to an episode of Two Fit Chicks and a Microphone (the Intuitive Eating episode), based on caryesings's recommendation, and I would definitely recommend their podcast. It's a pleasure to listen to them. However, it's not scientific or super instructional (as far as I can tell); they just offer their experiences and opinions. It looks like their episodes run about an hour. I also would love to hear other recommendations!

Inside Out Weight Loss by Renee Stephens.