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More as3.0 goodness

Method closures

Event handling is simplified in ActionScript 3.0 thanks to method closures, which provide built-in event delegation. In ActionScript 2.0, a closure would not remember what object instance it was extracted from, leading to unexpected behavior when the closure was invoked. The mx.utils.Delegate class was a popular workaround; to use it, you would write code as follows:

myButton.addEventListener("click", Delegate.create(this, someMethod)); 
Delegate.create(this, someMethod)

This class is no longer needed because in ActionScript 3.0, a method closure will be generated when someMethod is referenced. The method closure will automatically remember its original object instance. Now, one can simply write:

myButton.addEventListener("click", someMethod);

about fucking time!

Adobe - Developer Center : ActionScript 3.0 overview