m. c. de marco: To invent new life and new civilizations...

Protagonize

Via the aggregator: Mashable reviews Protagonize, where interactive fiction becomes buzzword compliant:

Protagonize would like to update this concept, not only with the contributions of the users, but with a bit of web 2.0 mixed in there as well. While there are countless websites out there that have an ongoing, round-the-robin formats for collaborative stories. Protagonize puts some handy tracking tools in there so that you can better stay afloat with the stories you like and those that you create.

Update

Protagonize still exists, but its focus is now “standard stories”, not addventure.