8 Essential Qualities of Great Leadership
A good list from a few years back.
I think Managerial Competence too often gets overlooked. Most professions promote people to leadership positions based on how good they are at their job. But production in the workplace doesn't necessarily connect to leadership responsibilities. The best sales guy in the company isn't necessarily equipped to run the company. That mistake is made way too often because we want to be "loyal" to the people who have done a good job.
Producing for an organization and leading an organization are two very different things.