The source code is a treasure trove for those looking for an example of a larger Backbone.js application with a Rails backend and Faye for push notifications to the browser.

Backbone code - https://github.com/cloudfuji/kandan/tree/master/app/assets/j...

Faye (on the Backbone side) - https://github.com/cloudfuji/kandan/blob/master/app/assets/j...

Faye (on the Ruby side) - https://github.com/cloudfuji/kandan/blob/master/app/models/a...