From a pastor-friend:

If you want to set up an accountability group, I recommend you have a look at Gary Kinnaman's Leaders That Last for some pointers. (The book's subtitle is How Covenant Friendships Can Help Pastors Thrive.) Those who want a more intense accountability type group, might have a look, for example, at the kind of group Ken Blanchard describes in his recent book Lead Like Jesus : Lessons from the Greatest Leadership Role Model of All Time