For regular downloads, check the SwingX project website.
Automated Builds
We are building from CVS directly using Hudson. These builds are run through automated unit tests--only download if you are willing to work with possibly rough stuff.
Generally, SwingX documentation is sparse. Several places to try for javadoc and/or examples:
The javadoc coverage varies ... wildly, nevertheless we try to improve continously. Some contain example code in the class doc. So risking an eye at the latest version occasionally might be a good idea.
SwingX source builds come with simple demos, under the src/demo directory
SwingX source builds have a src/test directory: besides the typical unit test (postfix: "Test") there are classes to exercize the visual components (postfix: "VisualCheck"). Technically they are unit tests with a main to run as an application. Doing so will call all or a subset of the methods named "interactiveXX") which typically creates and shows a frame with some aspect of a SwingX component. Reading that code might give an overview of recommended practice.