Via Twitter, I found a report comparing opensource CMS Drupal, Joomla, Wordpress, and Plone: http://www.idealware.org/blog/2009/03/new-report-comparing-wordpress-joo mla.html
Free registration is required, but it seems like a handy guide. Perian Sully Collections Information Manager Web Programs Strategist The Magnes 2911 Russell St. Berkeley, CA 94705 Work: 510-549-6950 x 357 Fax: 510-849-3673 http://www.magnes.org http://www.musematic.org http://www.mediaandtechnology.org
