Some of the big technologies, the ones with the deepest impact on the everyday work lives of people, prove to be some of the least complex to learn and use. Think e-mail and the word processor. After having mastered these tools, you stand back and ask the question every meaningful innovation begs: why didn't someone invent these sooner? So too will users demand an answer to this question: couldn't someone have invented the corporate wiki years ago, when I could have first used it?