I've had a thought that I can't really say is real original, but its a new thought for me. I've talked a lot about design decisions in blog entries, but I never considered actually discussing design decisions in the text of a game before. I'm sure someone has done it in the past, they must have.
It would just make sense that if you shared the whys of the system, players would have an easier time understanding how it works and how to put the system to work for them.
Have you ever done this? Did you get good or bad feedback from it?