By far our favorite CMS! Joomla is a built-in flexible component, making content administration and maintenance very easy.
CMS we work with
Wordpress is probably the easiest CMS to work with as an end-user. Originally created specifically for blog-oriented web site, the CMS has now spread out worlwide and is certainly one of the most used CMS on the Web.
Drupal, though widely used throughout the Web is not as popular as the two mentionned above. Part of it probably comes from its steeper lurning curve.