ITtoolbox Java Discussion Group - For the technical and functional discussion of Java. - http://java.ittoolbox.com/groups/technical-functional/java-l
Yahoo Java Groups - Directory of Java-related mailing lists from Yahoo, on topics from certification and development, to user group specific. - http://tech.dir.groups.yahoo.com/dir/Computers___Internet/Programming_Languages/Java
JDJ Straight Talking - For readers of Java Developer's Journal interested in talking honestly about various subjects, includes subscription information and archives. - http://tech.groups.yahoo.com/group/straight_talking_java/
Caffeinated Penguins - A Java discussion list for Linux users. This is to fill the need for a small volume, small membership group, for people who use Linux and are interested in learning more about the Java language. - http://tech.groups.yahoo.com/group/caffeinated_penguins/
Java Open Source Mailing List Archive - A collection of archives of Open Source Java project mailing list. Lists include Tomcat, JBoss, Struts, iText. - http://www.junlu.com/
JAVA/400 Mailing List - Discuss JAVA on and around the AS/400. AS/400 Java toolkit, and JDBC. - http://lists.midrange.com/mailman/listinfo/java400-l
Javalanche - Mailing list for developers of web applications using Java tools. - http://www.pairlist.net/mailman/listinfo/javalanche
Java Boutique's JNews - Newsletter about the latest applets, industry news, and developer trends. - http://e-newsletters.internet.com/jb.html
DevelopMentor's Advanced-Java - Advanced topics, includes subscription form and archives. - http://discuss.develop.com/advanced-java.html
Advanced-Java - Industrial-strength application development, includes subscription form and archives. - https://lists.xcf.berkeley.edu/mailman/listinfo/advanced-java
Java List Archives - Directory of Java-related mailing lists available from Sun. - http://archives.java.sun.com/