Here is the list of cheat sheets which are very useful when your developing new theme or plugin.

WordPress Theme Development Checklist

Download PDF : Download Cheat Sheet »
Source : wptoy.com

WordPress CheatSheet

Download PDF : Download Cheat Sheet
Source : andywibbels.com

The WordPress Help Sheet

Download PDF : Download Cheat Sheet
Source : wpcandy.com

WordPress SEO Cheat Sheet

Download PDF : Download Cheat Sheet
Source : tekka.de

WordPress Template Tags

Download PDF : Download Cheat Sheet
View HTML Version : View HTML Cheat Sheet
Source : bueltge.de

WP Widget Cheat Sheet

Download PDF : Download Cheat Sheet
Source : bueltge.de

WordPress Loop

Download PDF : Download Cheat Sheet
Source : bueltge.de

WP Plugin API Cheat Sheet

Download PDF : Download Cheat Sheet
Source : bueltge.de

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