Plugin to tag articles and show tag clouds – info here.
Installing Xmap for Joomla
Xmap is a site map plugin for Joomla that generates maps of your sites content and articles.
Joomla tags uses Xmap to generate a tag cloud page of all availabe tags.
Installation instructions are here. The downloaded zip contains two other zips. Unzip the downloaded zip and then use the Module Install link in the Joomla administration to upload and install each of the other zips.
Joomla Tutorials
Configuring jSeblod CCK Subcategories
jSeblod CCK adds support for Categories and Subcategories in Joomla, a feature which is not supported in base Joomla.
For further information see here.