Google's next Open Source project
A prediction: In a few months time Google will release a project called 'GDT'. GDT is somewhat similar to GWT except that rather than compile Java to HTML+JavaScript, it will compile to Swing. So rather than being Google Web Toolkit, it will be Google Desktop Toolkit. You'll then be able to take the same source, and get out of it either a desktop app, or a web app.
While we're on the subject, the same idea in reverse: I wonder if anyone at Google is working on having JavaFX compiled using the GWT compiler?