Audible Resources
Reasonable Faith
The main outlet for Dr. William Lane Craig ministries, a premier apologist and Christian scholar, general Q&A, audio and video of debates, audio of his Defenders bible study class, etc.
Cross Examined
The main outlet for Dr. Frank Turek ministries, a great apologist, author, general Q&A, audio and video of seminars, his Cross Examined podcast is wonderful.
Unbelievable
Faith Explored - Conversations that Matter - That is what you get on this ongoing series of podcasts that feature a wide scope of Christian concerns and doctrine.
Audible.com
Audio recordings of 1000's of books, with a wide selection of your favorite Christian authors. These are reasonably priced.
Overcast Podcast App
A free app that allows you to search for podcasts by topic or title, very easy to access great Christian discussions.
On Being
Over nine years worth of weekly, 1-hour radio programs covering varied topics from a Christian perspecive. Many of today's top theologans and persons of faith are interviewed. Christa Tippett poses thought provoking, grass roots questions to her guests with frank, considered responses. A great way to spend time learning about how God is at work from many angles.