Part 1. using module class suffix. http://userwrittenresources.com/index.php?option=com_content&task=view&id=28&Itemid=4
oo come on guys this guy don't have much knowledge. I think Postnuke with various hacks i.e templating, blocks, SEO friendly URLS. Plus the person don't need to work much in it. Article posting the really really easy in Postnuke.
You can find the list of best free open source cms scripts on http://www.phpopensourcescripts.com/scripts/content-management-systems/