ComputerCraft also has an "education" version, which includes a visual programmer for turtles similar to scratch (which also allows you to switch to the generated lua code as well)
That's really cool. Haven't played since late September, so I might not be on top of all the changes going on with modded Minecraft. I heard of the Teachergaming thing on another thread on here in a thread on MinecraftEdu.
Really neat.