Jacek Furmankiewicz has been blogging for a while on a pet project of his called JavaBuilder. In the latest post he shows the fruits of his labor, I must say it is simple fascinating. By combining the notion of Groovy builders (specifically SwingBuilder)with a ZoneLayout-like DSL crisscrossed with MigLayout (using YAML) you are able to quickly prototype a Swing UI. If you are into desktop Java this project may save you a lot time.