I also find this site interesting. Newbies and old-timers alike will find the articles and tutorials useful. the site I’m referring to is How to Joomla.
The site’s articles range from simple things such as installation to more advanced ones like embedding videos and the likes into your Joomla site.
This is a security release and contains a number of bug fixes, improvements as well as security fixes. It is strongly recommended that users immediately upgrade. It has been nearly four weeks since Joomla 1.5.6 was released on August 12, 2008. The Development Working Group’s goal is to continue to provide regular, frequent updates to the Joomla community.
Another source of Joomla templates is Joomla Market. Though giving away free templates, they also have Club Templates, wherein you have to pay in order to use the templates commercialy.