One of the popular buzzwords floating around out there right now is "servant leadership." Like all buzzwords, it is easy to say, and easy to subjugate.
One of the best terms I have heard that helps set the thinking is "span of support." Normally leader-to-lead rations are discussed in terms of "span of control." By saying "span of support" instead, the entire concept is turned on its head.
That makes it much more clear that the job of the leader is to ensure his or her people have what they need to succeed, to help them clear problems, and develop them professionally.