My friend Josh Evans recently posted a list of leadership books that he recommends. His list was good (although I haven't read most of them), but I think he left a few excellent titles off. Because of that, I decided to create a list of my own.
The Conviction to Lead: 25 Principles for Leadership That Matters by Albert Mohler.
The Catalyst Leader: 8 Essentials for Becoming a Change Maker by Brad Lomenick.
Of course, my list and Josh's list don't completely exhaust the topic of leadership. However, our lists are a great place to start if you want to get serious about improving your leadership abilities.