AFAIK there's nothing like GWT for anything except Java -- if you want to develop a desktop-style UI, then deploy the same code unchanged to a browser, the only other alternative is Flash, which is one more thing to keep up to date on the client side.
Sounds like you missed the SVLUG presentation on XML11 a couple years back. It's not entirely divorced from Java insofar as there's a Java server involved, but the client code is all JS with X11-like XML messaging connecting the two. It includes (among other things) an AWT implementation in JS.
I initially thought GWT might be a descendant of XML11, but I'd guess it's actually an independent implementation of some of the same ideas.
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