MetaCasts.tv has done a series of videos for each of the three big frameworks (Angular.js, Ember.js, and Backbone.js), resulting in almost 4 hours of videos. In each of these series we will build the same example application (and no, it's not a todo list!). By building the same application you can easily compare and contrast the different styles of each of these frameworks to help better understand which one is the right one for your next project.
http://www.metacasts.tv/angular-ember-backbone-screencasts