CodeJunkies.net
AspNextGen.com
GotDotNet.com

http://www.vbws.com/

DynamicDrive.com - for Javascript DHTML Source Code
Code Arena
HTML Guru

Java.Sun.com
Java Documentation and Training
Learning the Java Language
The O'REILLY Java Books

MathTools.Net - The technical computing portal for all your scientific and engineering needs

XSLT Reference
Site Valet - Tidy Online - convert your HTML to xHTML
XMLDir.com - The Directory of XML Resources
Microsoft MSDN XML/XSL Home
XML Spy - good XML/XSL editor
MarrowSoft Xselerator - Xselerator is a fully functional XSL/XSLT IDE (with XSLT debugging!)
Lifesupportal Free Tutorials