Wall Street is littered with disgraced CEOs, but one star still sparkles: Jamie Dimon, chief executive of JPMorgan Chase. "We've made the same dumb mistakes," he insists, "just smaller and less of them." Still, his pearls of wisdom must be more valuable than average, so read on for his management pointers. "It's not how smart you are, or even your communication skills," he says. "It's your clarity of thinking, your work ethic and your effectiveness."