Some links for you to enjoy:

LnF articles:
http://developer.java.sun.com/developer/techDocs/hi/jlf.html

http://www.javaworld.com/javaworld/jw-04-1998/jw-04-crossplatform.html

LnF graphics repository:
http://developer.java.sun.com/developer/techDocs/hi/repository/

Free Swing Book :
http://java.about.com/library/swing/bl-Swing-Book.htm

A commonly posted Java User's website that contains nice examples of more advanced usages of Swing:
http://www2.gol.com/users/tame/swing/examples/SwingExamples.html

And it is great to search the forums for answers:
http://forum.java.sun.com/"