I ran across Drew's blog recently and enjoyed his thoughts. As I am preparing for a church plant I am constantly thinking about the forms and functions of the church. The functions seem relatively clear - the forms do not. What I mean is this - we would all agree (I think) that the church should gather together as a body for times of corporate worship - that is a function. The form of worship is largely left open - how many songs do we sing, what year were they written, what instruments, what time do we start and stop, where do we meet...
Check out this article by Drew Goodmanson - it is very thought provoking.
Triperspectival Ecclesiology - Being the Church as Corporate, Intimate & Group