Joomla 2.5 makes it possible to create a multilanguage website, out-of-the-box, without any 3rd party extensions.  Here you can download a Multi-language Checklist to make it easier to set up such a multilanguage website.

The main parts of Joomla 1.5 on two A4 sheets. That's the db8 Quick Reference Guide for Joomla 1.5. This Quick Reference Guide describes Joomla 1.5 in a nutshell.

This Quick Reference Guide is an overview for people who want to help out with improving the Joomla software.  All software contains small errors ("bugs") and Joomla is no exception.