Platforms for Creation of Online Communities

This article from ZDNet is an analysis of Dion Hinchcliffe's point of view on regarding the 'Ten leading platforms for creating online communities'. As he mentions, online communities no longer are thought of as simple tools for fun, they are now being viewed more as opportunities, and ways of 'getting things done'. Without much further ado here are the top ten platforms that Hinchcliffe recommends:

1.Joomla
2. Drupal
3. PHP-Nuke
4. zikula
5. Share-Point Community Portal
6. Lithium
7. dotnetnuke
8. Community Server
9. Kickapps
10. ClearSpace Community

Let me know if there are any others that you feel have been left off the list!