• Sun's Swing Trail http://java.sun.com/docs/books/tutorial/uiswing/index.html
• Sun's Java2D^? trail http://java.sun.com/docs/books/tutorial/2d/index.html
• Sun's JavaSound^? trail http://java.sun.com/docs/books/tutorial/sound/index.html
• Sun's Full screen mode trail http://java.sun.com/docs/books/tutorial/extra/fullscreen/index.html
• Sun's Drag and Drop trail: http://java.sun.com/docs/books/tutorial/dnd/index.html
• JACK - Java All Class reference Kit makes it faster and easier to browse packages,classes,methods and fields.

Competing Products

• Customizing button using Avalon styling...

Tutorials

Java in general

• Planet Java Good tutorials (all in PDF) in categories Design, Language, Performance, Sever, Swing & XML.
• Churchillobjects Also some nice tutorials ...
• ClientJava.com Client / Desktop related Java focused portal.

UI Desing

• Elegant design is provided here !! Check out First First Aid for Swing UIs, Layout and Panel Building & Layout Essentials .