PHPClasses.org: MODX: A CMS Framework Designed with PHP Developers in Mind
If you have ever wrestled with trying to create a custom Web site using a CMS that made you jump through hoops to get the desired output, you should definitely check out MODX, a CMS framework designed from the ground up with Object Oriented Programming PHP developers in mind. Read this article to learn more about MODX CMS framework and how you can easily use it to build your own content management system customized to your needs.
The article introduces you to MODX and shows you (briefly) how the MODX manager works to help you create a site quickly and easily through simple configuration options and content creation. He also talks about "chunks", template variables, plugins/extras and xPDO - their abstraction layer for database connections.