For Devs (and players) who are not aware, there is a series of videos on YouTube called Extra Credit. They have over 100 episodes and their topic is games and game design. They talk about everything from sex to balance and they give specific examples to get their points across. Knowing what the typical game attention span is, the videos are 7 minutes long or less. They contain some very specific points to designing games that I think should be noted.

I strongly recommend everyone go and watch a few and see for themselves.