here is all I could find on it.
jGABL (public): Package swingx
also
Theres currently a project in progress called JDNC (Java Desktop Network Connectivity). I believe SwingX is a part of that project..
Check out
community.java.net - JavaDesktop for more information.
Hans Muller talked at JavaPolis in April and it seemed that the project is still under heavy development..