Really neat. I must be living under a rock, but I never had heard of this before. It seems to bring a lot of the advantages of component-oriented development with it - just declare and go and the implementers will have taken care of the necessary wiring behind the scenes to make the components work. What I don't have a feel for though is what disadvantages it might bring from component oriented development - how easy for example would it be to change the style and/or behavior of the expanded component dom objects, in a way that the original developers never thought of, if need be? In any case, very cool and thanks for posting.