This year, ASIJ's Middle School students have two 30 minute periods a week called Choice Activity. It is self directed, so they can choose to learn anything they want. I've been exploring game design with a group of students using both MinecraftEdu and the Steam for Schools version of Portal 2.
I recently gave three workshops on using MinecraftEdu at JASCD's Try It On Monday conference. Basically, I taught other teachers how to play Minecraft! Also, how to set up a server, mods, ideas for use in their classroom, etc.
The official information on getting started with the education version of Minecraft is not very clear, so I created my own MinecraftEdu Teacher Cheat Sheet that I try to keep up to date. It can also be found on the MinecraftEdu Project page, along with all of the other resources from the workshop.