Minecraft Snapshot 12w07b released

This week's Minecraft Snapshot has been released! New this week is the 'Anvil' world format, Villagers will 're-populate' villages depending on the number of empty houses, a new unnamed light source powered by redstone, mob item drops are even harder to get now, all animals (and presumably mobs) use the new AI, and 'Some nights in villages will be worse than others'. Also, this snapshot will convert your worlds to the new format, so make a backup :)

Client: http://assets.minecraft.net/12w07b/minecraft.jar
Server: http://assets.minecraft.net/12w07b/minecraft_server.jar