Good stuff. I like the dispatch idea. I've encountered the need for a way for views to talk to each other as well, though I ended up using another Backbone Model for that.
We've employed this idea in Typecast (typecastapp.com) and it has proven really useful. One thing to watch out for is how you namespace events... Make sure and stick to a consistant format.
Typecast looks gorgeous. If you're interested in getting listed in the example apps on the Backbone homepage, email me a brief description and a 550px-wide screenshot...
