Or, you can try a completely different approach. Why not blog, and then turn your blog into a book? People can follow along with your articles, post their comments so that when you finish writing your book, you can make a better one. Well, I recently discovered leanpub and thought this idea was brilliant. I read most of their articles and totally bought in.
But, when I tried to use their software to convert HTML to PDF, I discovered that their "lean" style also meant "lean" design. I really wanted something that would be teacher- and student-friendly with funny or insightful comments in the margins. If you've ever used a LooneySpoons cookbook, then you know what I mean. Anyhow, I really wanted to use leanpub, but I guess I'll have to use my own site and stay at home.
I've heard of another site called scribd, so I may have to give that a look. We'll just have to see!