Ah, yes, the podcast from Dr. Phil Plait (The Bad Astronomer from badastronomy.com) and Dr. Pamela Gay. I heard the first one they did, but hadn't caught up to it again until your post link - thanks! I guess this is only like the 4th one they've done or so. They are definitely worth listening to.
I found it interesting that neither one of them really dissed or wrote off MOND (MOdified Newtoninan Dynamics) theory - I've been on other forums where many folks have nothing but disdain for it. Can't say that I really understand MOND in all of its strong points vs. it's weak points, but I wonder if Phil and Pamela were being more politically correct rather than expressing their honest personal opinions.