Concentris has upgraded its site to the Joomla! 1.5 system. The open source Joomla! developers and interface designers have almost entirely re-factored the old code. This new version is more powerful, flexible, secure, and more intuitive to use than previous Joomla or Mambo versions.  If your business or organization needs to manage a great deal of content, with multiple administrative roles, and wants the many functions of a dynamic Web 2.0 site, the PHP-based Joomla! framework might be a good choice for you.