First of all, thank you for the invitation to join this space.
There is a project as Syslab that is coming to a conclusion shortly, called Collaborative writing. It’s all about using new (or new-ish) technology to collaborate when writing for instance a research report. Examples of these technologies are Google.docs (aka Writely) and different Wiki platforms.
The focus of the project is not so much on the technologies per se but to understand how to organise and set them up so as to support the collaborative writing in the best possible way.
I’ll drop a notice in this space when the results of the project is published and becomes widely available.