Gareth Williams mentioned this site that has audio messages by Dallas Willard on the Kingdom life. I've just started them myself, but anything by Dallas is worth hearing in my book.
On Spiritual Formation: "Fire Within" by Thomas Dubay
On Reaching Out To Others: "The Insider" by Jim Petersen
On Leadership: "Leadership and the New Science" by Margaret Wheatley
On Community: "Waking the Dead" by John Eldredge
On Church Planting: "Church Planting Movements" by David Garrison