From the Site:
If you’re like me, there are countless things you should know - but don’t. Don’t worry, there are people that spend their time digging up this info so we don’t have to. Make sure you know these things, there’s going to be a quiz later!
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Beginning Joomla! (Expert's Voice in Open Source)
Joomla! 1.5: A User's Guide: Building a Successful Joomla! Powered Website (2nd Edition)