I have had the good fortune of managing Agile (scrum) implementations at a number of different companies over the years. I have had some great success and some implementations that were not so great. While not unique, my experience is such that I have enough data points to start seeing patterns, especially patterns of failure. That is, while I cannot confidently tell you what will most certainly work in your particular situation, I am eminently qualified to tell you what will not work.
When in doubt, google. I found the definition for leadership from about.com – “Leadership, a critical management skill, is the ability to motivate a group of people toward a common goal.”
I would guess that this definition is innocuous enough, but I just can’t seem to completely agree. I know that a lot of people think that leaders are great motivators. While this may be one of the by-products of leadership, I have always maintained that great leaders do not motivate others but create the environment whereby self-motivated people will be able to flourish.