For my final (aka thesis) project at ITP, I redid an earlier project, Written World, which came out of Clay Shirky's Designing Converstational Spaces class. The final product is live and online at writtenworld.org.
A communal free-form text world, overlaid on a street map of the user's physical location. It incorporates elements of online chat and graffiti to explore and create a bridge between the physical and virtual.
Actual discussion of what I did, why, and how, to follow.