You can use a blog as a collaborative curriculum development tool!
My colleague and I are co-teaching our Media Seminar class to the juniors and seniors. Team-teaching can be as challenging as it is rewarding. One of the major headaches is keeping track of the awesome lesson plans and project ideas that we seem to change on a daily (if not hourly) basis. So I am blogging our lesson plans, and revising them as we reflect on what worked and did not work each day. It’s a bit of work, but I think it will pay off when we need to repeat the curriculum in the second semester (and in years to come!).
I am blogging our lesson plans here :http://tbamediaseminar.blogspot.com/