I recently got a glimpse into the future of books. A few months ago, I dug out a handful of old essays I'd written about innovation, combined them into a single document, and uploaded the file to Amazon's Kindle Direct Publishing service. Two days later, my little e-book was on sale at Amazon's site. The whole process couldn't have been simpler.

Then I got the urge to tweak a couple of sentences in one of the essays. I made the edits on my computer and sent the revised file...