There is an article on Fast Company describing the business lessons hidden in the online multi-player game, Minecraft. In fact, a Swedish school has been reported to be using the game as part of their curriculum.
My two sons are definite Minecraft aficionados and have already taken to many of the lessons. The game has served as a platform for showing them how to launch a business built around the virtual world. The two have begun work on creating how-to videos, modifications and even parody songs. Great way to take a fun pastime and make something educational and possibly profitable.
Read the articles for more.