Collaborative Futures: how FLOSS Manuals produced a book in 5 days

Here's how you can get involved: http://en.flossmanuals.net/write

I was part of the Intro to Command Line sprint and it was a fun experience. Any contribution is welcome; iirc mine was only 1.5 chapters. You just 'reserve' the chapter you're writing to prevent duplicate work, clarify the goal of the chapter, and off you go.

If you're worried about the quality of your writing, rest assured an editor will come along to clean things up. It's a great way to contribute to Free Software, given that documentation is considered by many to be its main area of weakness.