http://media.minecraftforum.net/content/images/2012/10/14.png

You can update your client simply by starting up Minecraft, and selecting to update at the prompt.  Have fun!

Changelogs:

  • Added a beacon
  • Added flower pots
  • Added item frames
  • Added anvils
  • Added cobblestone walls
  • Added pumpkin pies
  • Added carrots and potatoes
  • Carrots can be put on a stick to control pigs while riding
  • Added a boss mob
  • Added a new skeleton type
  • Added witches
  • Added bats
  • Added mob heads that can be placed
  • Zombies now infect villagers, but can also be cured
  • Added wooden button
  • Items can be cloned with the “pick block” action in Creative Mode
  • Items can be quickly moved to the hotbar by pressing 1 through 9 while hovering an item
  • Added /difficulty, /spawnpoint, /weather, /gamerule and /clear commands
  • Added “target selectors” for commands
  • Added option to hide capes
  • Added option to toggle vertical synch
  • Added customization to superflat worlds
  • Minor additions to the world generator
  • New potion recipes
  • Leather armor can be dyed
    • Maps now start more zoomed in, and can be extended
    • Redstone repeaters can now be set into a “locked” position
    • New sound effects
    • Portals to the Nether can now transport items and mobs
    • Adventure mode now allows placing and removing blocks, but only when using the correct tools
    • Changed method of placing sideways wood logs
    • Improved server list
    • Improved debug (F3) options
    • Spawn protection is now automatically disabled if there are no defined admins
  • Removed Herobrine