Comparing Open Source CMS Programs

As I have been going around the diocese, I have talked a lot about using Content Management Systems (CMS) to develop websites.  The three major open source programs (read:free) are WordPress, Joomla and Drupal.  I have been looking around trying to find a fairly definitive and impartial comparison of them and I think I found one. is an excellent resource for nonprofits to evaluate software options.  They have created a fairly extensive report comparing four different systems (the three previously mentioned as well as Plone) in this report.  There is some nice background on CMS systems, but if you want you can jump right in at page 8 for a thorough comparison of the four systems.  Well worth the time to read.