Stephen R. Covey’s perennial bestseller, The 7 Habits of Highly Effective People, has sold more than 15 million copies. Now his legions are eating up The 8th Habit: From Effectiveness to Greatness (Free Press). Covey’s latest delivers far more philosophical heft than the average biz book, and a companion DVD. Beyond that, expect the classic Covey numbers game: 5 Cancerous Behaviors, 4 Disciplines of Execution, 3 Components of Spiritual Intelligence, etc. And millions more bucks in the Covey coffers.