If you think about Seth's recent post about loving customers in the context of leadership, a leader has two customers. There' s the external customer who ends up paying for the experience. And then there's the internal customer, the staff...all the people under the leader's care.
I've seen many managers totally miss the point of "who serves who" inside the organization. They have this idea that employees are there to serve them, to do what they say and follow their "lead". Great leaders recognize the opposite is true. They know they are there to serve everyone else, to inspire, to remove obstacles, to comfort, to teach...to create leaders.
Best plan for a leader is to always treat employees like customers. Failure leads to distrust, disgruntlement and finding someone else to buy from.