I've just committed mavenized version of swingx under the swingx-r3734-mavenized branch.
If you know nothing about maven here's the basic:
download and install (unzip) maven from http://maven.apache.org
you should not need to configure anything apart from geting maven/bin on your path so you can run maven
to build swingx you need to run "mvn install" or "mvn clean install...
As Karl mentioned already in his blog, SwingX 1.6.1 was released few weeks ago. There were some issues uploading the artifacts to central repo this time, due to previous nexus migration and changes in structure of repositories, but all is solved now.
To use 1.6.1 simply update your pom to
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