There never seem to be enough hours in the day to read all you need to read much less all that you want to read. When is comes to managing, consulting and coaching, there are several that top the list from my perspective. I categorize these as must read for anyone in the business of managing, consulting or coaching. They include:

Harvard Business Review
All of the business magazines, this one is essential for anyone in management, consulting or coaching. Read ever issue cover to cover. Visit: http://www.hbr.org/

Good to Great by Jim Collins
One of the well researched, well written and truly applicable books that applies to management, consulting and coaching. See your on-line bookseller and visit: http://www.jimcollins.com/

Anything by Peter F. Drucker
Peter Druckers work is, for the most part, timeless. Do not limit yourself to reading only his later books and other writings. See your on-line bookseller and visit: http://www.peter-drucker.com/

Anything by Tom Peters
Sometimes Tom Peters comments seem off the wall but he remains a true visionary and is always insightful and exciting. See your on-line bookseller and visit: www.tompeters.com

Wall Street Journal
Well balanced, well written and always up to date with the latest on all aspects of business and finance (the language of business). The Wall Street Journal

Anything by Scott Adams
You have to be able to laugh at yourself and often Mr. Adams hits home whether he takes aim at HR policies, systems and processes or practice (or lack) of management. See your on-line bookseller and visit: http://www.dilbert.com/