With the help of jashkenas, I created this app to test my implementation of Backbone.js for MooTools (http://github.com/jeromegn/backbone-mootools) and my localStorage adapter (http://github.com/jeromegn/Backbone.localStorage for those interested). It just so happened that jashkenas had been aching for a decent example app, so he reported it to jQuery and included it in the repository.
My own version of this demo is available here (with an extra sorting feature, and built on MooTools) http://localtodos.com/ (source: http://github.com/jeromegn/localtodos)
Hope you like it.