These are 3 implementations of the same thing. I can imagine there are people using Backbone, YUI, and EventEmitter. Oh, and they might be using some other library which shims the EventTarget interface and uses CustomEvent objects.
Read the Holowaychuk article. We need to stop working with frameworks and start working with components. How great would it be of I could use Backbone without Events (not picking on Backbone.Events here, just an example), or use a JQuery function that one of my libraries requires without including all 32k of it.
