Some critical articles to understanding implementing a CCK module in Drupal

I recently wrote a module implementing a CCK field. There is a lot of undocumented information required to be known to do so. Fortunately some people have written tutorials ...

Functions needed to define a new CCK field; Field placement module thoughts

Poplar ProductivityWare Articles: Creating a Compound Field Module for CCK in Drupal 6.x by Jennifer Hodgdon

Creating a CCK field in hook_install()

Define Content Types And CCK Fields For Your Custom Module Using Content_copy

Programmatic CCK content type creation

Creating a custom compound field for CCK

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