Let me say first that the books on this list may not be for everyone. They are deep, they don't necessarily follow traditional thought, although, they don't deviate as far as some would claim. Lastly, they are all books I enjoyed and learned from.
Easily one of the longest titles, A Christianity Worth Believing: Hope-filled, Open-armed, Alive-and-well Faith for the Left Out, Left Behind, and Let Down in us All" by Doug Pagitt left me wanting more. Much of it is first hand stories from his life.
Much more deep, N. T. Wright's "What Saint Paul Really Said: Was Paul of Tarsus the Real Founder of Christianity?" was an interesting and deep glimpse into Paul's life and thought processes. The take away from this for me is the cultural setting Paul wrote in. Especially when most of the epistles start similar to "Paul, a bond-servant of Christ". In the culture he is in, Paul was risking death as he just wrote -- "Jesus is Lord, Caesar is not".
Finally, N. T. Wright's "Following Jesus: Biblical Reflections on Discipleship" was amazing. He took sermons he had preached which were high level summaries of several books in the New Testament and brought each one back to the Eucharist.
Currently I am reading "The Shack" by William P. Young which is a fictional account of his character's meeting God in three persons. I have friends that can not say enough good about the book and others that didn't like it at all. So far, I'm liking it. The biggest problem is the hype around the book.