If you are aware of the work the Freedom From Religion Foundation (FFRF) does than you may already be aware of the Freethought Radio podcast. If not, this is a freethought/humanist/atheist podcast you should definitely add to your list. The FFRF does some amazing work and you should definitely become a member if you believe in the strong separation of church and state. If you’re not quite familiar with the FFRF, please check out their website or check out one of their podcasts.
The Freethought Radio podcast is hosted by Annie Laurie Gaylor and Dan Barker. They do an amazing job promoting freethought and discussing issues related to the separation of church and state. This is a MUST on your podcast listening list!