I've just been talking to someone about that. Leverage has one of these too, and it really sounds like a lot of fun. I just don't want to commit to a comm where regular participation is required in order to stay a member, even if the requirements are said to be low stress. Anyway, a bunch of people on my friends list post fic originally written for the challenge comm, so it seems to be a creative place. But to see what exactly is going on there one has to join first.