Civilization IV/Modding

Python

 * Modding basics
 * Python Console
 * Tips and Tricks
 * TGA's Python Tutorial
 * Python in Civ 4
 * Civ 4 Python Class Reference (by Locutus)

World Builder

 * Dale's "Modding Guide for Civilization IV Volume 1" covers designing scenarios, using the world builder and editing world builder. It is available at CivFanatics.  This thread contains both the World Builder manual and manually editing a WBS file.

Graphics
There are no graphics tutorials at present

Scenarios
There are no scenario creation tutorials at present

Mods

 * Adding a Civilization
 * Other mods