I love Timothy Keller's podcast and R.C. Sproul's podcast. I also do a weekly podcast called "Kingdom Conversations." You can find it on iTunes by my name (Roger Legg) or here is the Link to my church website to subscribe:
Mars Hill's Christian leadership ministry the Resurgence has a lot of good stuff too (videos and articles) I recommend for anyone in a leadership role.
This is one area where I need to broaden my experience. I eagerly look forward to seeing what you all recommend.
(Our church just revamped our website. The three most recent sermons are on the front page. http://www.timberlakechurch.org)