I am not a rubyist and I almost dismissed your book because of the title because I assumed it would lean heavily on concepts from ruby with which I would not be familiar and therefore be no more enlightening than the official rust tutorial. i.e. I assumed it would teach one foreign concept based on another foreign concept.

Originally I envisioned more of that, it just didn't shape up that way.

Hopefully I will have something better and more generic near the 1.0 release ;)

Awesome. Looking forward to it.