The Spoken Alexandria Project, in their own words, "is creating a free Creative Commons library of spoken word recordings, consisting of classics in the public domain and modern works (with permission). AAC, Ogg Vorbis, and MP3 audiobooks available for free download and redistribution."
That means you can listen to everything from Franz Kafka's Metamorphosis to Bulfinch's Mythology to a booklet from the National Institute of Mental Health on Men and Depression. If you want to read more widely but you don't have time (or you don't want to spend a lot of money on audiobooks for your commute), the Spoken Alexandria Project is a good step in that direction.
My favorite work on this podcast (and one I've re-listened to again just this past week) is the six-part series by Tobias Buckell, "Getting Past Joe Blow Neopro." This is his effort to describe what it takes, as a genre writer, to move beyond those few semipro acceptances and become a true professional author. I especially recommend part 6, on planning your career, including the use of visions and milestones. Go check it out. (And hey, if you haven't read at least one of his books yet, do!)
In fact, even if you don't subscribe to this podcast and listen faithfully to everything they produce (and to be honest, although I *am* subscribed, I don't necessarily listen faithfully), you should at the very least download Tobias Buckell's contribution and listen to it. That alone is enough to make this one of the best podcasts for writers. (Though contributions from Kafka, Twain, and Franklin don't hurt.)