ComputerWorld: The tablet phenomenon is bigger than you probably realize. Before the "new iPad" debuted, Apple announced that it had sold 55 million of its tablets to date. Apple CEO Tim Cook helped put that figure in perspective at a conference in February: "It took us 22 years to sell 55 million Macs," he reportedly said. "It took us about five years to sell 22 million iPods, and it took us about three years to sell that many iPhones." The fact that the iPad sold 55 million units in less than two years tells us something: Tablets are a runaway success.