What makes a good Project Leader

I was watching one of my new favorite shows, The Celebrity Apprentice, and as the teams have narrowed down to about 4 on each side. I've had a chance to see several Celebrities take the lead as Project Leader. Very interestingly - few seem to do it well. The Celebrities that focus on the task at hand and make that priority, seem to do much better that those that focus on "Being in charge." Funny what we can learn from watching others.