Sadly, I Code2Design does not have everything you could ever want (*yet*). So below you will find the lists of sites I refer to when I need to learn a new trick or web language. Please note that these aren't ordinary tutorial sites - they are the best-of-the-best! - Making this arguably the most valuable page on C2D! So bookmark this page and you will always be able to find an answer for your questions.

Top Learning Sites

W3 Schools
CSS Discuss
alvit.de
Weberdev (Crazy site filled with tons of junk you can't find.)
DevShed
Ebooks World
Pixel2Life (Tutorial Search Engine)
Planet Source Code (12,000,000+ lines of code)
Sitepoint

PHP

PHP Manual (Browsing the PHP Manual will teach you a lot!)
Hudzilla (A PHP book online)
W3Schools (60+ PHP Lessons)
PHP Freaks (90+ Tutorials and 2000+ Articles)
Tizag (40+ Mini PHP Lessons)
PHP @ Resource Index (4000+ Resources - and hopefully something useful!)
Hotscripts PHP (1,000+ Tutorials)
Zend (Developer Zone)
PHP 101 (15 PHP Lessons)
MelonFire (Random Tutorials)
CodeWalkers (PHP and MySQL)
OnLamp (PHP Books)
DevShed
PHP Classes (Thousands of Free PHP Classes)
Planet PHP (List of PHP blogs)
WebMonkey
php.net (First PHP Lesson)
PHP Editors (Free PHP Code Editors and more)
Sitepoint PHP/MySQL

PHP Videos

(Other than this site:)
Jonathan Sampson
PHPVideoTutorials
Killer PHP
VTC (Demo PHP Videos)
Adobe
SoftwareTrainingTutorials

Scripts

HotScripts (10,000+ PHP Scripts)
Resource Index (PHP Scripts)
HotScripts (2000+ Javascript Scripts)
Hotscripts (50+ XML Scripts)
TopXML (25+ Lessons)
Scripts (Thousands of Scripts)
Dynamic Drive (JavaScript and CSS scripts)
Big Web Master

XML

W3Schools (25+ Lessons)
Tizag (40+ Lessons)
HotScripts (100+ Tutorials)
W3 XML
XML

MySQL

MySQL Manual
Tizag (20+ MySQL Lessons)
DevShed
MySQL Tutorial
Good MySQL Lessons
HTMLite MySQL Intro

CSS

CSS-Discuss (Loads of Css Topics)
CSS Reference
Tizag CSS (20+ CSS Lessons)

JavaScript

Tizag (30+ Tutorials)
HotScripts (200+ Tutorials)
DevShed ()
WebMonkey

Free Layouts

CSS Discuss (Great XHTML/CSS Layouts)
Open Web Design
Open Source Web Design
Free Layouts
Layouts 4 Free
Free Web Templates
Free Web Layouts
Code Sucks
Max Design
layout Gala
PS Templates
Web'n

Layout Galleries (For Inspiration)

CSS Vault
CSS Remix
Cool Homepages
CSS Beauty
CSS Reboot
CSS Galleries
CSS Zen Garden
Style Gala
Web Creme
CSS Thesis
CSS Import
UnMatched Style
CSS Drive
Daily Slurp
CSS Bloom
Design Meltdown
Best Web Gallery