One of the first questions I ask of other leaders is, "What are you reading". My District Superintendent up in Atlantic Canada, HC Wilson, makes his reading list available so that others can get in on some very valuable resources. The last time I was at a Willow Creek Conference, Bill Hybels and others printed their reading lists for us.
Not that I am assuming that anyone out there really cares what Tim is reading, but these thoughts may spur you a little bit to look into some new titles, ask other leaders what they are reading, and stay as sharp as you can.
"The Present Future" by Reggie McNeal - this is a re-read for me. Rich Moorlach from WIF was so excited about this book that I decided to pick it up again. It's a must read for anyone who gives a rip at all about the church.
"How to Start a New Service" by Charles (Chip) Arn - I met Chip out in California recently and his book is one of the required texts in the master's class I'm currently taking. Written way back in '97 ;-) This book is still filled with relevant ideas. Think about it: Your church can probably reach new people simply by starting a new service.
"Simple Church" by Thom Rainer - Another must read
"The Rhythm of Prayer" by Mark Moore - A solid book by a solid guy with a creative edge