There are few problems that keep us from just jumping right in with podcasts in the classroom. For starters, if you use the native apps on your phones it is a bit difficult to search out topics unless you know what you are looking for. Secondly, the varying lengths of podcasts makes it difficult to use in class if everybody is listening to different podcasts. Lastly, you have to decide what you want to do with the podcast... how do you structure discussions and questions to get the most out of this medium?
PodCircles aren't about the podcasts themselves, but more importantly, how to structure the unit around it to make it work.