Keep in mind that collaborative journalism is just a branch of collaborative writing. Really, journalism is just a content focus. As such, collaborative writing systems could be transformed to support collaborative journalism with reasonable ease.
- MoJo (http://metatalk.metafilter.com/mefi/3081) (in development; Mojo wiki (http://mssv.net/wiki.cgi?MoJo))
- Blogalization Conspiracy (http://blogalization.org/conspiracy) (in development; development blog (http://blogalization.org/conspiracy))
TakeDown.NET -> “Collaborative-journalism-systems”