I wrote a short article (and listed some resources) on Church Planting Movement Keys at our ministry blog.
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