Learn.js: a guidebook to building projects with javascript.
leanpub.com
leanpub.com
I do like the idea, also because you plan to explore (in a fashion that does not require full serial 'consumption' of the book) various JavaScript toolboxes and libraries and even server-side stuff. I can't put any sensible price tag on it though.
Side note: in a 80/20 world, 10% finished would mean that roughly half of the draft is written ;)
I decided to remove the percentage for now since it was an arbitrary number. I'm not even sure what will make the book 100% if I plan to go back and add/revise chapters as js libraries are updated/released. Using semantic version numbers and a roadmap would be better.
I'll add a list of completed/started/planned chapters to the book description soon, which will be much more useful than a percentage.