The book, Implementing World Class IT Strategy: How IT Can Drive Organizational Innovation by Peter High is a great follow up to Peter's first book World Class IT: Why Businesses Succeed When IT Triumphs. This is a must read for every business leader.
The book shares relevant examples of real-world CIOs overcoming the traditional challenges companies face when developing strategies. As a CIO I find having an IT mission statement crucial for focusing my teams. Chapter 3 goes into great detail on the value of an IT mission statement and provides some great, real-world examples. My favorite is on page 56.
This is a book I've given to my leadership team and I highly recommend reading it. You'll probably want to keep a copy close by for frequent reference.