Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Drupal is a modular content management system. It allows a user or group of users to construct Web sites, blogs, or forums by providing the framework for users with little or no PHP or database experience. It grows more popular with each new release because it becomes easier to use each new release. Drupal 6.0 (and 6.1) were recently released after a year of development. The new features and improvements make for an impressive content management platform.
The beauty of Drupal is how highly customizable it is. The more PHP you know, the more powerful it becomes. But even if you don't know any PHP you can build and run a great-looking site by utilizing Drupal's many built-in and contributed modules as well as the various themes. Some of the sites running Drupal include Warner Brothers Records, Popular Science, and The Onion. If you need help, you can find lots of handy documentation and a friendly user forum on the Drupal Web site.