Custom Properties is a Joomla! 1.0.x and 1.5.x extension for adding custom properties to content items.

The complete package consists of a component, 2 modules and 2 plugins.

The component manages the properties and general configuration, a module lets you search "tagged" content items and the other shows the tags as a "cloud". The plugins (mambots) show the tags on content items.

 

Sounds promising? Bear with me, I'll explain.