I have used the Xoops CMS for quite some time - and have chosen it again as the primary content management system for the major of my portals - with the possible exception of some of the niche specific areas. About 2 years ago I conducted a thorough evalution of most CMS systems and at that time Xoops was head and shoulders above the rest. For this project, it came down to two … Drupal and Xoops.

I chose Xoops largely because of my familiarity with the user permissions and block structure. Also I like the fact that I can insert custom blocks consisting of PHP or HTML code.

That said, I am VERY impressed with Drupal. I may still go that direction on at least one site and give it a whirl. At least on the surface, Drupal looks very Web 2.0.

Others that I liked:
Joomla/Mambo
MODx

But you don’t have to take my word for it - you can always check out all the open source CMSs and decide for yourself at OpenSourceCMS. This is a great resource for keeping your eyeball on the CMS world.

Dan