I've been so busy lately customizing my Linux machines that I missed the fact that Eitan posted the latest JMatter release 5 days ago, you can see the changelog here. Among other things you will find a new feature based on AnimatingCardLayout (as described by JavaJeff in this article). The following pictures don't do justice to the runtime behavior, but you can clearly see before, in between and after states once you click on Edit, if you click on Save/Cancel you'll get the reverse animation.

Before


Clicked on Edit


After


And here is the Map feature I talked about in a previous release, the Address domain class exposes a "View on Map" command, which will popup a new window using JXMapKit (from swingx) to render the map. Notice that Eitan has taken care of properly setting an overlay painter that draws a balloon with the address' info.