Some leadership resources from the business world.
John P. Kotter is best known for his books and as a professor at Harvard Business School. He has made some of his ideas available online. Some useful stuff on change. Click here and then click the green bottle!
Jim Collins of From Good to Great fame has also made a lot of resources available online. Worth a look.
And Patrick Dixon has so made so many resources available I doubt anyone would ever get through them all!