This is the best walkthrough for learning Backbone.js that’s been posted to Hacker News yet. (In that I actually feel empowered to go use Backbone to create something, now that I’ve read it). Thanks for posting!
Backbone itself isn’t all that opinionated: it just offers a bunch of legos to put together however you wish, feeling free to ignore many of the pieces. So it’s easy to feel adrift trying to learn how to use it confidently.