Esus
   FAQ-like collection of answered and unanswered questions, with categorized collection of links.
   http://www.esus.com/

Java Coffee Break
   A free guide to the world of Java programming, packed full of free articles, tutorials, book reviews, and FAQs.
   http://www.javacoffeebreak.com/

JavaCommerce
   Collection of tutorials, FAQs, and articles.
   http://www.javacommerce.com/

JavaFAQ.nu
   Publishes tips on the site and in newsletter (twice a week).
   http://javafaq.nu/

Starting Java Development
   Installation and setup help articles, like PATH and CLASSPATH issues.
   http://homepage.eircom.net/~pugsleypaul/java/jstart.htm

SwingWiki
   Collection of tips, tricks and howtos for J2SE Swing programming.
   http://www.swingwiki.org/