One that I posted on Twitter last week, BBC Learning English Drama, which is an excellent BBC podcast series:
— Tom Walton (@Tom_IHBCN) May 16, 2015
In weekly episodes of 6-10 minutes, they are retelling both classics and stories specially written for the series, with Jamiaca Inn the current story. Probably suited for B2 (or a good B1) and above.
As a language teacher, what more vital role do you have than getting your learners started on independent mobile learning?
Podcasts that they will enjoy and learn from are a great way to achieve just that and you want to be recommending that kind of thing!