iKillers: 10 Biggest Threats Facing Apple

Apple recently achieved a milestone some may have thought unthinkable a decade ago. Its valuation surpassed $620 billion, making Apple the most valued company in history. And this is before the hotly anticipated iPhone 5 and rumored iPad Mini debut. Is there anything that can knock Apple off its pedestal? Not any one thing. But there is a combination of competitors and internal challenges that could derail this juggernaut.