The primary sources are of course the d.o. handbook pages about CCK, the CCK Group on g.d.o., and the source code itself.
There are also a lot of blog pages all over the web, which I'm trying to gather here. I'm opening comments on this page so if you find any good page elsewhere, please add a comment about it so it can be added to that list.
| Topic | URL |
|---|---|
| Ensure field modules updates do not run before content.module updates | http://drupal.org/node/304813 |
| Terminology: Unraveling the mysteries of the cck (and the cck docs) | |
| What is the Content Construction Kit? A View from the Database | http://www.lullabot.com/articles/an_introduction_to_the_content_constru… |
| Moving CCK field changes from dev to live ("macro" method) | http://www.lullabot.com/articles/moving-cck-field-changes-from-dev-to-l… |