Further Mexica content: Emily Short's review of MEXICA, procedurally generated stories around Aztec legends.
The creator, Rafael Pérez y Pérez, has articles here :
MEXICA: a computer model of a cognitive account of creative writing
The Three Layers Evaluation Method for Computer-Generated Plots
As what we watch and read becomes more closely monitored, proc gen art will become the new pulp. I'm laying down a marker, here.