Marshall Goldsmith's website and picking an article for a little self development. Recently I came across an article entitled To Help Others Develop, Start With Yourself which I found helpful. The article starts with this statement, "Great leaders encourage leadership development by openly developing themselves." This single line gives the core element of the article which is to get improvement out of others, a goal of leadership, you much improve yourself.
One tool Goldsmith uses is the 360-degree feedback review. This allows a leader to get data on how those who report to him or her feel about how the leader's work has been done. Then the data is collecting later and compared to the original to find areas of growth or areas where more work is needed. This is difficult but it's something that can result in great improvement. Even if you are not in a position to do this with a large team it can be done with co-workers, family or friends. Any group of people who care about you getting better can help with this exercise. The hard part is to listen, learn and change.
The end game is to lead by example. Improve yourself through measured consistent feedback and others will get on the bandwagon.