Writing Excuses - http://www.writingexcuses.com/
Writing Excuses is a podcast hosted by the following authors:
Brandon Sanderson - Author of the Mistborn series and selected to complete the Wheel of Time series after Robert Jordan's passing
Dan Wells - Author of the John Cleaver series and several other novels
Howard Tayler - Writer and illustrator of the webcomic series Schlock Mercenary
Mary Robinette Kowal - Author of a few novels and a plethora of short stories.
All of these authors are traditionally published.
The podcast is 15 minutes long, making it fairly convenient for listening. I listen to one episode in the morning, sometimes one on lunch as well. Each episode focuses on a different subject, from brainstorming to villans to "killing your darlings", or ideas that you've really taken a liking to but ultimately hinder the story.
I originally started listening to this podcast simply because Brandon Sanderson was a part of it, but after listening to several episodes, I've found his co-hosts just as articulate. With SEVEN seasons of this podcast available for listening, it honestly feels like I'm stealing. This kind of knowledge shouldn't be free. If you're serious about writing, I suggest you give it a listen.
If you've listened to a certain episode and want to talk about it, this would be a great place to do so!