I was presently surprised by this book, I was expecting to find a technically skewed book that focused on how to use Joomla! but instead I found a richly featured tome that went way beyond the basics of how to drive the Joomla! GUI to create a site.
The author covers a number of important related topics that include the factors that contribute to a successful search ranking and what extensions he's successfully used himself in the creation of Joomla! websites. No hype just plainly written explanations and several great examples that show the power of the Joomla CMS.
People wanting to get started with Joomla, note this book does not explain how to write extensions for Joomla