A few weeks ago, I showed you the best cheat sheets for web designers. Following that post, many of you showed interest in having cheat sheets to help you write code. That is no surprise since the skill set of many web designers today go beyond visual design. So whether you are a seasoned programmer or just starting to learn how to code, these cheat sheets are going to be a big help to you.
WordPress
The WordPress Help Sheet
The Advanced WordPress Help Sheet
ExpressionEngine
ExpressionEngine Quick Reference Chart
PHP
PHP Cheat Sheet
MYSQL
MySQL Cheat Sheet
Ruby on Rails
Ruby on Rails Cheat Sheet
JavaScript
JavaScript Cheat Sheet
Scriptaculous Cheat Sheet
jQuery 1.3 Cheat Sheet
mootools 1.2 cheat sheet
Prototype 1.6.0.2 Cheat Sheet
XHTML
(X)HTML Elements and Attributes
HTML/XHTML in one page
CSS
CSS Cheat Sheet (V2)
CSS CHEAT SHEET
ActionScript
Actionscript 2.0 Cheat Sheet Flashpaper
ActionScript 2.0 to 3.0 Migration Cheatsheets
Papervision 3D Cheatsheets
Other resources
The people at Dzone have some more great cheat sheets for developers that you may want to check out:
RefCardz