[Sorontar]

The latest snapshot (http://www.mojang.com/2012/09/minecr...shot-12w36a/):

• Client: http://assets.minecraft.net/12w36a/minecraft.jar
• Server: http://assets.minecraft.net/12w36a/minecraft_server.jar (or EXE)

The main features:

• A new scary decoration block - skulls of mobs
• The “secret” from previous snapshots is now spawnable - the Wither
  • Is summoned by arranging a few mob heads in a certain way
  • Place 3 pieces of soulsand in a T-shape and place 3 Wither Skeleton Skulls on top to create it
  • Drops a Nether Star on death
• A new mob variant in the Nether - Wither Skeleton, a skeleton with a sword
• The “work in progress block” is now called “Beacon” and can be crafted
• Carrot on a stick! to help guide pigs you are riding

For more details, see Redstonehelper's reddit notes