There is a pretty interesting conversation going over at Internet Monk regarding Mark Driscoll's method of church discipline.
Let me start by saying that I was not there. I do not know how bad this situation was. But I agree wholeheartedly with the comments made by the IM community regarding the harshness, legalism, and anti-gospelic nature of the Mars Hill response. It would not be hard to imagine the letter to church members regarding excommunicating this member as being identical to a posting on a medieval Catholic church door.