Here is some recommended reading. All very accessible and good to come back to after an initial read:
The Adventures of an IT Leader
by Robert D Austin, Richard L Nolan & Shannon O’Donnell.
How to make an impact as a CIO, even when you’re not from IT.
From Good to Great
by Jim Collins
Excellent reading for leaders everywhere. Reminds us of the importance of raising the bar and keeping it high.
From Good to Great and Social Sectors by Jim Collins
In this monograph, Collins applies his principles to public sector settings.
IT Savvy by Peter Weill & Jeanne W Ross
Good tips for general business managers wanting to improve their strategic IT view.
Corporate Politics for IT Managers by Keith Patching & Robina Chatham
One of the best, no-nonsense texts around, especially if you’re new into IT management.
Virtual Teams by Jessica Lipnack & Jeffrey Stamps
It’s all about managing relationships in this fascinating insight into the reality of ‘virtual’ teams.
Our Iceberg is Melting by John Kotter
An easy read with big messages from leadership guru Kotter.
8 Things We Hate About IT by Susan Cramm
This is very honest and pragmatic no matter where you sit in an IT project. A helpful read, despite the title!
Benefits Management: Delivering Value from IS & IT Investments
by John Ward & Elizabeth Daniel
A comprehensive guide to the principles and good practices of benefits driven IT-enabled change. Most importantly, how to realise real value from IT.
Strategic Planning for Information Systems
by John Ward & Joe Peppard
Essential reading for re-assessing the strategic focus of IT portfolios.
I Wish I Worked There by Kursty Groves 
Fascinating peek behind the scenes at some of the world’s greatest creative work-spaces.
Rework by Jason Fried
Excellent no-nonsense guide to building a business that works and that lasts.