XML-based GUI

I recently had to develop a Swing application. I touched Swing only a few times before. And because of that lack of experience I didn't want to do it manually. It would take much too long (and is quite boring too). XML based GUIs seemed a valid alternative. A little research and I ended up choosing SwixML.
With SwixML you can define all the user interface in a single XML file. This has several advantages: you clearly decouple presentation from business logic, it's easier to code and the resulting XML file has a lot less lines than the corresponding Swing code. Also, for those who know the Swing API well, transition to SwixML should be smooth. All Swing components have a corresponding XML element with the exact same name. Properties also have the same name. You can think of the XML structure as a complete representation of the Swing GUI components. This is also a clear advantage for SwixML developers: there's no need to explain what the elements and attributes are. A link to the Swing API suffices (after code-reuse, we now have documentation-reuse).
Be sure to check the samples page to see the simplicity of the XML structure.