How to create a static page in Zen Cart

How to create a new sidebox in Zen Cart

How to include a new style sheet in Zen Cart

How to edit the look of...

A better way of dealing with large define() statements

The Zen Cart execution process

Custom template notes

Some opinions on Zen Cart

I Kill Spies: Modify your Zen Cart
Documents one person's journey into learning how Zen Cart works.

Properly Customizing Your Site, Using Over-rides
Explains how overrides (templates) work.

Zen Cart layout, default_template based
The default Zen Cart main page with all table borders turned on, so you can see how things are laid out. It also notes which CSS selector is being used for each part of the page.