[Adam White] "Collaborative Editing;
Sometimes we have a need for multiple editors to work on the same project. In FCP7 we simply create a project file for each editor. All of the referenced media is in one shared location for all of the projects. At the end of the process, all of the editors' sequences are pulled together into one, final master project."
This has been discussed a lot recently. I've used PPro in a workgroup in an assembly line fashion on a SAN and it's worked well. But there is a fundamental difference in the way PPro handles merging projects that you should be aware.
See this thread:
http://forums.creativecow.net/readpost/3/925208
Not a show stopper, but something to consider in planning your workflow.
Alex