Been looking into some opensource CMSes lately, and it’s just a jungle with too many implementations. Logemann has a good writeup on some of them here. He also points to cmsmatrix for comparing features.
I’m playing around with Drupal right now, and it looks ok. I’m a bit confused by the structure of the admin system, but it seems to have what I want. Of course it’s more of a community thing, than many othe CMSes.