Steve Jobs is rightfully credited with many insights and many advances in technology. But here's a different way of looking at Jobs' contributions to computing.
Before Jobs, everyone interfaced with their computer by using their keyboards. The Mac popularized the mouse driven interface. The iPad popularized the touch driven interface. Now the iPhone 4S is on the verge of popularizing the voice driven interface.
Jobs didn't revolutionize the computer - he revolutionized how we INTERACTED with the computer. And each advance made the interaction between man and computer less computer like and more liked by humans.