Here is a less controversial article br Brian McLaren: Underneath the Cosmetics - LeadershipJournal.net.
Rick Warren popularize the Purpose-Driven Church. The five purposes of the church, according to Warren are worship, evangelism, discipleship, fellowship, and ministry/service.
I think Brian challenges us to consider the questions, "What do all these 'purposes' add up to?" For Brian it is the fulfillment of God's mission of transformation for the world.
I find myself definitely on the emerging church side of things.