There are unlimited opinions floating around about the role of management. Many come from voices that would have management be removed from the process - the extreme agile point of view.
For those looking to understand how management has and is evolving in the "post industrial" age, here's a nice article A NEW ROLE FOR MANAGEMENT IN TODAY’S POST-INDUSTRIAL ORGANIZATION
The Ivey Business Journal is free Business Journal from the Ivey School of Business, University of Western Ontario.