This game aims for a multi level narrative. You play a scholar studying the lives of people in the past. In the course of the game you simultaneously create the story you are researching as well as the story of your scholar. The game is created and presented as a narrative of a group of scholars who are piecing together the story of some event from various sources and who have their own agendas to fulfill with the story that is told.
Sounds complicated? I know. But it's simpler than it seems. Have a read and judge for yourself; I don't want to paraphrase here and direct attention away from the author's site, because aside from anything else the game deserves attention. What interests me about it is that it's an honest attempt to do something with PBP/PBEM that only it can do. As a player of online games, I'm very familiar with the frustrations of trying to carry out traditional gaming with the format. It is possible, but it can be tough going. This provides a model not only for a system that works well with the format, but which goes to the next level and makes it actually gameable in and of itself. I like that and appreciate the effort put into doing it.