Actionscript web service and web method call classes
I don't see why would you put every method of the service in a separate class. A "method" is a function of the class. I imagine you wanted to decouple your code, but doing it this way you will force a lot of overhead:


the service is instantiated for every 'method' called, and then, hopefully, garbage collected (as you remove event listeners and there's no more references to the service left)
because of above, the service is stateless; with time you may want to add some functionality like caching, but you'd need to change whole code structure for that
CfdWS - not descriptive name; your way of decoupling code will force you to make three or even five times more classes then you normally would, so I would expect a hell on the file-naming level
really, dividing to so many classes is not a good idea - you don't want to switch between files all the time; try to put related code in one Class, and if it grows big, create some helper classes


I think you already understand the benefit of a good MVC implementation, try Robotlegs, it really makes a life easier:
http://www.robotlegs.org/