Dave Gray notes that "games and play are not the same thing." He will teach you to bring games into the work place to get work done. I think one of the side effects is that you may start to have fun. For many people work will never be the same as play. Yet if you want to change the world (thank you Steve Jobs); if you wish to have a purpose aligned life, then you will need to find a way to make play equal to work. For me, this involves bring games into the work place.
Games and the Human
Agile tools for your iPhone - a list