If you haven't tried it, it is worth getting the free software and giving it a spin. I broke down several weeks ago and got a really nice (unfortunately, NOT even close to free... ) and while nothing replaces a real book for good relaxing reading, it is an awesome study tool.
BTW - two recent books I found very interesting:
"leadership from the inside out - examining the inner life of a healthy church leader" by Kevin Harney was a very pratical and insightful guide to church leadership. Charles Swindoll's book on Paul was a very interesting biography and a great study of the leadership lessons you can take from one of the greatest Christian leaders in the history of the Church.