I am rereading Dave Fleming's book, "Leadership Wisdom from Unlikely Voices." It is excellent and practical exploration of the leadership wisdom that the leaders from Church History offer us. Fleming surveys leaders such as Francis of Assisi, Augustine, Hildagard of Bingen and Mother Teresa of Calcutta. It is a worthwhile read.
Here is a link to Fleming's website: www.davefleming.org
And his blog: http://davefleming.typepad.com/