"The JGoodies Forms framework helps you lay out and implement elegant Swing panels quickly and consistently. It makes simple things easy and the hard stuff possible, the good design easy and the bad difficult."
"The JGoodies look&feels make your Swing applications and applets look better. They have been optimized for readability, precise micro-design and usability."
Swing Tips&Tricks along with samples and source.
High-level Swing GUI components like Editable List, Tree Table, Checkable List or Checkable Tree.