The Ruby on Rails Tutorial (http://railstutorial.org/ http://railstutorial.org/) has been a successful product business (six figures per annum), and in fact I'v

The Ruby on Rails Tutorial (http://railstutorial.org/ http://railstutorial.org/) has been a successful product business (six figures per annum), and in fact I've recently taken the core publishing technology and turned it into a platform called Softcover. It's currently in private beta; sign up for an invitation here: http://www.softcover.io/ http://www.softcover.io/ As part of developing Softcover, I plan to write more about the details of making and publishing the Rails Tutorial (including a more detailed discussion of revenue numbers) starting some time next year. Stay tuned.