Students are asking to proof each other's work and teaching themselves how to screencast. They are learning how to do new things, earning experience points, and excited about learning. When Michael Matera @mrmatera decided to divide his classroom into houses, guilds, experience points, and badges in a competitive gamified environment, he had no idea what would happen. But he loves it and it shows.
If you want to know how Michael did it, watch this video where Michael transparently shares how he did it and what it is like. He addresses issues some have as a concern in terms of rankings (his don't relate to grades) and how he assesses.
It is so mind blowing, I'm going to have to rewatch. If you want to understand the leading bleeding edge of gamifying the classroom, this is a must watch video. Gamifi-ed OOC is classroom changing, join us.