I generally loathe those self-help/motivational things and avoid them like the plague, but the Ted Talks link that (I think) Dekka posted is totally worthwhile ;)
*Puck's head explodes* ROFLMFAO!!!! Help me remember the remarks about charity and blackmail for future use, okay? I'm going to be giggling over that ALL day.
This is a good companion to Sun Tzu; much of it deals with the qualities of a leader. While I don't agree with all of it, there's much of value, and the difference in time and culture has to be taken into account. LaoTze - TaoDeJing