"Some people were wondering what the acronym CCK stands for. CCK means Content Construction Kit. The CCK is a module to create custom content types within the Drupal CMS. It is a great and powerful feature we always wanted for our favorite CMS and its functionality has been requested by the Joomla community for a long time, so we created our own super flexible Joomla catalog component that comes with a comprehensive content construction functionality.
One of the ZOO's key features is that it gives you the ability to create your very own custom content types. Any developer who has created Joomla websites usually needs to publish different types of content besides a standard Joomla article. Here is an example: You would like to offer a bunch of downloads on your website. Currently there are a couple of ways to do this. A common one is to browse the Joomla extension directory for a component to handle this specific task. Usually you find download components with a rich set of features. But sometimes you have a specific functionality in mind that those components do not have, like when you want your visitors to be able to rate your downloads, or just add a custom field. Then you will likely run out of luck."
see
http://www.yootheme.com/blog/item/root/cck-for-joomla
...interesting....
