Angular Event Bus/Command Map Service 
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Prototype exploring an event bus and command map for Angular JS implemented as a stand alone service. A Scope Watcher service was also created as a hack to allow for a tear down to
be performed on controllers.

Demo: http://www.fluid.ie/angular/calculate/

The Angular JS team are also working on a scope based event bus implementation, you can check out their progress here: angular/angular.js#522

NB: This is a PROTOTYPE! It is not tested on all browsers. There are known issues with IE. I don't recommend using it in your projects!