Arcade Games Online If you want Java-based games, this site's got 'em in spades:
http://www.arcadegamesonline.com/
CodeGuru A nice collection of applets is augmented by forums, a Web-based newsgroup interface, and more:
Developer's Daily Designed with the Java programmer in mind, this site has links to tons of tutorials, FAQs, and applets:
FreewareJava.com Hundreds of applets, Java courses, links to other sites, and much more:
Gamelan This is "The Official Directory for Java" and remains one of the premier Java sites on the Web:
JARS.COM This site bills itself as "The #1 Java Review Service," and I have no reason to doubt it. You'll find thoughtful reviews of hundreds of applets in dozens of categories:
The Java Boutique A first-rate site with lots of applets, programming tutorials, Java news, articles, forums, and more:
http://javaboutique.internet.com/
Netscape's Java Developer Central If you think you want to learn Java, this comprehensive site is a great place to start:
http://developer.netscape.com/tech/java/index.html
ScriptSearch As I'm sure you've come to expect, this site has the Java good, as well, with hundreds and hundreds of applets to play with:
Sun Microsystems I mentioned earlier that Sun invented Java, so their site's a must-visit for news, documentation, discussions, and lots and lots of high-quality applets:
Webmonkey The famously simian site has a few nice Java tutorials and articles that are worth checking out:
http://www.hotwired.com/webmonkey/java/
Yahoo! Java Index A great listing of Java resources:
http://dir.yahoo.com/Computers_and_Internet/Programming_Languages/Java/