At TEDxPuget Sound in September 2009, Simon Sinek shared a simple but powerful model for inspirational leadership -- how great leaders inspire action. It all starts with a golden circle and the question "Why?" His examples include Apple, Martin Luther King, and the Wright brothers -- and as a counterpoint Tivo, which (until a recent court victory that tripled its stock price) appeared to be struggling.
Like all TED Talks, the run time of Simon's presentation is approximately 18 minutes. I know that is long; watch it anyway...