Jan, 2006 Cielo Systems has been working for several years with (and on) Drupal, an open-source community-based content management system. We've built a number of web-based projects on Drupal, as well as contributing to the development of Drupal itself by contributing code, participating in core development, and writing/editing documentation.
We've finally decided that it's time to eat our own dogfood and upgrade our own website to a Drupal based design.