Keep up the awesome work. This is by far the most real-world applicable intro to rails that exists. I recommend it to anyone I know that is looking to learn rails.
I am also absolutely loving this tutorial. I already knew rails, but actually building an application from scratch using RSpec and git is so valuable and something that the rest of the concise literature (i.e. books, not collections of blog posts from disparate authors found using Google) even come close to communicating.