What to read?
The game industry is an amazing community, but sorely lacking material on how to be an effective leader. Looking outside the industry you're in can provide a lot of perspective you wouldn't otherwise get.
These are some of the best books on business, leadership and creative product development.
Each has a distinct flavor and focus. More detailed reviews/breakdowns to come...
1. Good to Great - Jim C. Collins
2. Leadership Strategy and Tactics - Jocko Willinik
3. How Google Works - Eric Schmidt
4. Sorry Spock, Emotions Drive Business - Adam W. Morgan
5. No Rules Rules - Reed Hastings
6. Creativity, Inc. - Ed Catmull
7. The Visual MBA - Jason Barron