On December 12, 2013, Edutopia had an article about using Mindcraft for Cell Biology. Click here to see the article.
The Institute of Play had an online discussion where some participants discussed the use of Mindcraft in making roller coasters in a physics class (or could be slope in math class) and using Mindcraft in conjugating verbs in Japanese class (read French class here in Canada). The video is long though. The webpage can be found by clicking here. Seeing that most teachers want our classes to go semestered next year, projects like this would now be possible with your students during class time.
Recently Connected Learning also hosted an online discussion on the uses of Mindcraft as an educational tool. You can see several of the video chats by clicking here.
There is a Google Group/Forum for teachers where I read about a teacher asking for advice on how to have a student use Mindcraft for a bookreport. The Forum can be found by clicking here.
Minecraftedu has a links page to real world examples if you are interested in trying this in your class. To see this link page click here.