Today I found out some interesting resources for book authoring.
Software books writer Scott Meyers gives developers tips on how to manage such a project.
As Tim Ferris wrote and proved with the 4-Hour workweek, writing a book can be a one man business muse.
Modern tools such as Asciidoc from O'Reilly can facilitate the workflow so that it very much looks like the workflow of software engineering with build and continuous integration aspects.