Three years ago Steve Jobs told an industry conference that the "post-PC" era had arrived. We were seeing a migration of technology he said away from personal computers and towards smaller more intimate devices. The PC like the pickup truck was becoming a luxury that few people needed. Instead we would be seeing more products like Apple's (NASDAQ:AAPL) new iPad which at the time was one of the fastest selling electronic devices in history. What Jobs didn't talk about -- and what the media largely overlooked -- was Apple's failure to grow its core PC business. Despite more than ...