hao!
wordpress on the right hands can transform into a CMS (i think)... plug-in customizations, pages for time independent content rather than blog posts, and blog posts for news and logs... etc.
i still prefer joomla 1.5 and mambo, I can't make a sense with xoops. Other good ones are drupal and e107 (from what I've tried 'til I decided to continue blogging instead).
Joomla has a blog functionality, some component called myBLOG... haven't tested it yet, but that shouldn't stop anyone from trying. the reviews seem convincing.