allgemein

tech definitions - whatis.techtarget.com

HTML/CSS/Javascript

Quirksmode
Google Code: Web Authoring Statistics
Mike Foskett: Useful CSS snippets

Prototype

Sergio Pereira: Using Prototype

JQuery

Core API Documentation
"JQuery for Javascript programmers"

YAML

YAML: Yet Another Multicolumn Layout | Ein (X)HTML/CSS Framework

PHP

PHP.net
PEAR
ZEND
PHP Links Linuxsource
FPDF
Keith Devens' XML-RPC Library
ADOdb Library for PHP - Manual

Smarty

(...ich mag's nicht, aber was nützt das manchmal?)

smarty.php.net
codecomments.com

Regex

regular-expressions.info
Mastering Regular Expressions (O'Reilly)

SQL

SQLSTATE Return Codes
phplens: Tips on Writing Portable SQL