Matt McGill (you might know him from Simply Youth Ministry Podcast or Saddleback Church) did a series of post on leadership killers. This was a five part series that contains uber amounts of goodness.
Check them out and learn from a leader.
Killers, part 1 >>> Fear and Insecurity
Killers, part 2 >>> Zeal and Apathy
Killers, part 3 >>> History and Territory
Killers, part 4 >>> Arrogance and Incompetence
Killers, part 5 >>> Indulgence and Impurity