Bob Logan has a new book out on church planting movements. I haven't read it yet but anything Bob does will be good. Ed Stetzer has read the book and this is what he thinks:
There is little that is done in North American church planting leadership that was not developed or influenced by Bob Logan. For thirty years we have taken baby steps toward true biblical church planting—but now this book will help us break through from church planting to church multiplication movements.