Rails Backbone.js

Gettting Started with  Rails

Tutorial Book

CloudEdit: A Backbone.js Tutorial with Rails 
Backbone.js really introduces a new kind of data flow for Rails apps. Instead of data flowing like this:Rails Model => Rails Controller => Rails View

It now flows like this:

Rails Model => Rails Controller => Backbone Model => Backbone Controller => Backbone View

What I've found is that overall, Backbone.js makes it really simple to create highly responsive Javascript heavy applications.