On Christian Wenz's blog today, there's an announcement about one of the latest books from Packt - Mastering Mambo which he was a co-author on.

When Tobias and I created the CMS book series for German publisher Hanser, we also wrote the first series title on Mambo/Joomla!. We afterwards sold the translation rights to Packt Publishing. They already had a Mambo book, but liked our material so they took the last two thirds of the book, translated it and thereby created "Mastering Mambo".

The book covers topics like creating custom layouts, builing multilingual sites, using a forum, using the Mambo extensions, and how to develop your own modules...