These are the books that I have referenced more in the first 1o months of this year than any other.  (I have linked the titles to Amazon)
Top 10
Living in Color by Randy Woodley (Culture – Church)
Making Room for Leadership by Mary Kate Morse (Leadership)
Cross & Covenant by Larry Shelton (Theology)
The Next Evangelicalism by Soong-Chan Rah (Church)
The Great Emergence by Phyllis Tickle (Church – History)
A New Kind of Christianity by Brian McLaren (Theology)
Whose is Afraid of Post-Modernism by John Caputo (Theology)
Beyond Liberalism and Fundamentalism by Nancey Murphy (History)The Tipping Point by Malcolm Gladwell (Culture)
The Starfish and Spider by Ori Brafman and Rod A. Beckstrom(Culture)
Honorable Mentions:
The Emergent Manifesto of Hope (Church)
Collapse by Jared Diamond (History)