Alan Hirsch, co-author of one of my favourite books The Shaping of Things to Come: Innovation and Mission for the 21st Century Church gave an excellent seminar on the mission of the church at a recent conference. You can watch it on video here (choose the Hirsch video, when you follow the link) . It takes about forty five minutes, but it is well worth the time.
A couple of good quotes from the video:
Within three to five years of people becoming Christians, they no longer have any significant relationships outside of the church.
We’ve got a darned good product, but our delivery system is stuffed.