Blog with Joomla - mojoBlog and MyBlog
I always thought one of the biggest problem with Joomla was that it did not come with a standard commenting system or a set of features for bloggers, like Wordpress does. But over the years, a lot of blogging components have been added for Joomla by third parties. See the full list of Joomla blogging components here. Of these, the two most prominent and feature-rich ones, in my opinion, are: