Just saw this cool project on Flexcoders: gwt4air. Gwt4air is project that allows you to use Google's Web Toolkit (GWT) to build Adobe AIR applications without having to learn MXML or Actionscript at all. For myself personally this has never been a problem, as I am fond of saying, if you know Java, you know MXML and Actionscript. Mind you, there are some things to learn, that goes without saying when learning any new programming language, but the similarities between the two technologies is so similar that the learning curve is small.
But with gwt4air, that learning curve is further minimized, and this now becomes one of these easiest ways for someone to immerse themselves in Adobe AIR programming coming from a Java development background. Basically write some Java code and voila, an AIR application is born! Then once the programmer is comfortable with that, they can then take the next step of programming directly in MXML and Actionscript, using the compiler, etc... Just another great tool for a great technology I say :)