Do check out Drupal, Joomla and WordPress (although WP is not yet as flexible as the other two).
I didn't mind the initial feel of CMSMadeSimple. It seems to have a lot of intuitive elements about it.
MODx looks stunningly sexy but I'd be concerned about how it scales for a really large sites (like thousands of articles).
SilverStripe looks really interesting. It seems to more of a "Page Management System" which is where we are wanting to head with Joomla. Scaling, to me, would still be a concern. The image manager is certainly impressive if nothing else. All good - lot's of great ideas to cheat off

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