The Dramatica: Secrets of the Quad class last night was absolutely insane. Melanie explained all you ever wanted to know about how Dramatica works and why everything under the sun seems to break down into quads. While she didn't reveal the secret sauce that powers the engine, Melanie did provide weeks and weeks of material for us to chew on.
Even for someone who has studied the theory for twenty years, I found the class overwhelming and mind-blowing. It's a rare treat to hear the mind behind a theory of story explain how it all works together.
On a side note, Melanie and I will be teaching a class on developing characters with Dramatica this Saturday. You can read more about it here.