Why would you promote this so early with a site devoid of content? Maybe it would be better to delete this submission until you have something substantial to show.
It is on github, and pull requests are welcome. It is currently written for Docker 0.5. I will keep it up to date, and when we hit 1.0 I'll look at getting some hard copies made, if there is a demand.
I still need to pick a license, not sure what is best for a book, open to suggestions.