In the world of open source CMS there is no comparison more attention getting than an article comparing Drupal and Joomla!. Probably, the granddaddy Drupal vs Joomla! comparisons of them all was posted over three years ago by the Joomla SEO company, Alledia. I extended the discussion Alledia started with my own comparison between Drupal and Joomla. My article evidently struck a chord in late 2006 and currently is approaching near 200,000 reads.
Good comparisons between Drupal and Joomla! are popular because quality comparisons between the two applications are rare. It's very difficult to have passion for one CMS, be well informed on both CMS, and in the end be non-bias in your comparison. In the three years since I wrote my article, I've only come across three additional comparisons between Drupal and Joomla! that I thought worthy to bookmark.
I haven't updated my own article comparing Drupal and Joomla because I have developed a bias opinion over the years that I can't overcome. Both are good applications in their own right, but in the end I almost always recommend Drupal over Joomla!. That's why I'm glad to see Alledia update their own comparison between these popular CMS with "Joomla and Drupal - Which One is Right for You? Version 2".