] Editing documents in groups can be a challenge.
] Versioning systems like subversion or cvs help your group
] to keep a consistent copy of your document, but don't
] provide realtime collaboration. Wouldn't it be great to
] edit the same document, live, in realtime, together with
] everyone in your group?

[ I've been using this for a while, just because it's a good text editor, with syntax coloring and such. Hanven't yet had occasion to use it collaboratively, but it seems a really well put together bit of software otherwise. -k]

SubEthaEdit - Collaborative Editing Software for OSX