Once upon a time...
It all started in September 2013. Having just returned from the first European Ember.js conference, my enthusiasm went through the roof. I wanted to spread the word, for people to realize how beautiful Ember is, for them to know that Ember.js is not that hard to learn. It's just a matter of having the core concepts internalized.
So without proper equipment (and after a few episodes, with a ~$80 mic) I started producing screencasts, a series in which a simple application is developed step-by-step. I sent the first few to my subscribers and kept producing them. And people seemed to have liked them.
Once the screencast series was finished, I switched to blog posts and lengthier articles, and in 2014 I committed to posting something of value each week. Then, after a long labor of (mostly) love, I published the 1st edition of the book in Feburary 2015, that used the then stable Ember version, 1.10.
I was not done, though. As Ember made progress in a neck breaking pace, I kept the book up-to-date with the actual stable version of the framework, and adding material that covered the new features.
Version 2 of the book, that is running on Ember 2, was published about 6 months later and I've been updating the book for every minor version ever since.
This book -- like Ember itself -- is for teams and individuals who want the productivity boost that comes from shared community solutions. Instead of reinventing the wheel, use Ember. Instead of scouring the web for advice on how to use Ember, read this book.