The Witch's Yarn
The Witch's Yarn, by Keith Nemitz, is an intriguing exploration that lies between hypertext fiction and IF. It's a lot like Card Shark and Thespis; an episodic drama where the system puts the characters on stage and the reader decides which character or prop should act next.
The catch, I'm sorry to say, is that Nemitz tries to cram a lot of characters on stage (in pairs) in very little time. This means he has to establish character much too quickly and to paint characters with much too broad a brush.
Thanks, Nate Matias (who writes more on the game on his weblog)!