What about Joomla

Joomla, is a free, open source content management system written with PHP for publishing content on the world wide web and intranet, using the MySQL database.
I mentioned it in my SEO Website Marketing (Chinese) Blog, in Best CMS in 2006.
Joomla! includes features such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, blogs, polls, website searching, and language internationalization.
The name is an English spelling of the Swahili word jumla meaning “all together” or “as a whole”.
So cool, the target of this project is All Together, put everything you need in to one application.
Please look at the roadmap of Joomla.
There will be a brandnew version 1.5, a completely re-written code base built with PHP 5.
I am strongly recommend Joomla to the CMS user. I like it.