1. Web Design Group (aka HTMLHelp.com). A really good collection of FAQs and docs and such, including the HTML reference.
2. Netscape's Developer stuff
3. Netcraft: What's that site running?
4. Image Magick, UNIX based image manipulation. Runs on Windows, too.
5. Matt's Free Web Scripts.
6. Dev Shed.
7. Lots of good, well organized Javascripts
8. MRTG
9. CGI-Resources
10. SysCon, The Java Dev Journal and XML Journal people
1. Cookies
   1. Cookie Stuff
   2. Cookie Stuff, from Netscape
   3. The Official Cookie RFC, 2109
2. Apache
   1. The Apache Software Foundation, the Official Site (www.apache.org)
3. PHP
   1. www.php.net This is the official site
   2. PHP Knowledge Base
   3. PHP Builder
   4. Newserver with PHP groups
   5. PHP Class Collection on Upper Design.com
4. Java
   1. Sun
   1. Sun's Java
   2. Sun's Java 1.1 API Spec
   3. Sun's Java 1.2 API SPec
   4. Sun's Java 1.3 API Spec
   5. Sun's Java 1.4 API Spec
   6. Sun's Servlets
   7. Sun's JSP
   1. Java FAQ
   2. JavaWorld, the magazine
   4. Java Developer's Journal
   5. Java Zone
   6. Symantec Visual Cafe Support Site
   7. JARS, The Java Applet Rating Service
   8. http://www.jGuru.com
   9. VisualAge for Java Tips --> http://www.javadude.com/vaj
   10. VisualAge for Java FAQ --> http://www.jguru.com/faq/VAJ