I listen to a lot of podcasts.  That's all I do while in the car.  Here is a list of all of the photography podcasts to which I subscribe.  Yes, the list is long and yes, I do listen to every episode.  Luckily there are many that are not weekly shows!  They're all good and they all offer unique content.  A few are available in both audio and video versions.  Some have a specific point of view, like travel or street photography, and others are more general.  If these aren't currently on your list, I suggest you check them out.

My favorite podcatcher is Downcast for  iOS.  Does everything I need it to and never fails me.  As of this writing, it's $2.99 in the App Store.

This Week in Photo (TWIP) with Frederick Van Johnson

TWiP Family with Jenny Stein - I love it so much I wrote a blog post about it.  Read it here.

Street Focus with Valerie Jardin

Mirrorless Minutes with Jamie MacDonald and Mike Boening

Digital Photo Experience with Rick Sammon and Juan Pons

The Candid Frame with Ibarionex Perello

The Digital Story with Derrick Story

Improve Photography with Jim Harmer

Out of Chicago with Chris Smith