WordPress Template Hierarchy
This article introduces one of the most important topics in WordPress development: the WordPress template hierarchy. It's one of the most important
Keryx (X)HTML Elements Best Practice Sheet
Detailed to the point of being almost unreadable!
suda.co.uk: Microformats Cheatsheet
My very own piece of the web to groom, feed, and play with
ILoveJackDaniels.com: Regular Expressions Cheat Sheet
Linux Command Line Tips
A great cheatsheet.