TodoMVC is an awesome project by Addy Osmani and Sindre Sorhus. In their own words:
Backbone, Ember, AngularJS, Spine… the list of new and stable solutions continues to grow, but just how do you decide on which to use in a sea of so many options?
The website now boasts of implementations using over three dozen frameworks. And I decided to pitch in using Mojito by Yahoo!