This would seem to be another article where the headline sounds more interesting than what the content turns out to be. The article tells us:
The pedagogical value of podcasts depends almost entirely on student motivation and the learning "context" of the application.
Podcasting does not contain any inherent value. It is only valuable inasmuch as it helps the instructor and students reach their educational goals, by facilitating thoughtful, engaging learning activities that are designed to work in support of those goals.
Isn't that a no duh? Isn't that any technology? It's not the technology - it's how you how you apply it?