Who cares? What it is, is new for a web app. They've managed to put together half a dozen pieces of really crappy web technology (_javascript_, DHTML, XMLHttpRequest) and managed to build a real client-server platform out of it --- and the real beauty of it is that practically everyone's got the client software already. By choosing Java as the front-end language they get to exploit Servlets for the backend, and allow people to program in a real programming language; by compiling it into _javascript_ before deployment they get to avoid horrible web browser JVMs... sure, it's a nasty, hacky reinvention of the smart terminals we had in the 80s, but it's one that works, and from what I've seen works really well, too.

And at the end of the day, that's the only thing that actually matters.

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