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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