Podcasts are great because they are free, filled with wisdom, and can be replayed anytime. I love to listen while doing tedious chores like laundry or cleaning.
Gospel Focused Christian Teaching:
The Village Church-Matt Chandler (start with the Awaiting Redemption series)
Seven Rivers Presbyterian Church (start with Bruised Reed series)
Walk in the Word-James McDonald (Must listen to the sermon entitled Why so Hard to Think Differently)