Cappucino is great , its problem is that it is just not debuggable for now , but maybe one day when it gets source maps. Otherwise it is a great framework.
Backbone is great because it is minimal , you can start small then grow with it , like sinatra ,etc .... i like that approach.
To expand on your helpful paste, for the detail-oriented among you, the full list of changes and diff is available here: https://github.com/documentcloud/backbone/compare/0.9.10...1...