Drupal is a very powerful open-source content management system based on PHP and MySQL technologies. Because of it power and sophistication, it is also a bit more difficult to customize the look and feel of Drupal sites than for say WordPress sites.
To get a general overview of what is involved in putting together a customized Drupal site, see this Drupal story of a developer who did a very customized Drupal site. See other Drupal success stories here.
We have also decided to use Drupal as the content management system for this site LearnWebDesignOnline.com.
If you want to try out Drupal without installing it, you can do so at OpenSourceCMS.com. For un-bias information about Drupal, see wikipedia.org.
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