On an installer related note, Tim over at Netbeans wrote a native installer for OS X. This code is probably a good starting point for anyone else interested in creating a native installer for their Java based OS X applications.
OSX Native Installer for Java (via Netbeans) What you'll find here represents a couple days working on using OSX's excellent package installation and management support for NetBeans. It is by no means complete, and there are no guarantees it will not wreak havoc with your system (but I don't think it will).
Essentially, it is simply a build file and a few additional files, which create an OSX style application layout, shoehorn a standard NetBeans distribution into that, and munge the startup scripts so they can find things in that layout.