It is widely thought that WordPress, Joomla and Drupal are the three best Content Management Systems. So which one should you choose to create your website?
WordPress is extremely easy to use and setup. It’s an excellent system to use when creating a website that lets you quickly get your thoughts out on the web, but while it is often used as a blog, it can be configured to work in many other interesting ways as well.
Joomla is an open-source content management system (CMS). It allows polls, RSS, search, menus, and more. Very cool and customizable templates. Not as user friendly as WordPress, but more robust content management capabilities.
Drupal’s advanced content management system more closely resembles a developer platform than a traditional CMS.
This article might help you decide between
WordPress, Joomla, and Drupal: http://www.goodwebpractices.com/other/wordpress-vs-joomla-vs-drupal.html
SlashDot on Joomla vs. WordPress: