Skip Matheny & R. Allen Wyke 
Up and Running with Joomla [PDF ebook] 

Need to launch a feature-rich website quickly where you have one or more people authoring the content? Want to use a powerful, robust, and scalable Content Management System (CMS) you can trust? This Short Cut will get you up and running with Joomla 1.5, a freely available open source CMS. Learn how to install, configure, customize, and extend your Joomla installation. Also learn the tricks of the trade in how to set up and manage both your content and your users. Joomla can be a challenge to understand at first, so drastically cut your "get up to speed" time by taking the Short Cut!