Minecraft Snapshot 12w28b

/say command works again
Updated sound engine and added minecart sound effects
Various other sound effect changes
A few tweaks to the witch mob
Nether loads faster when going through a portal
In creative mode, teleportation is instantaneous
Updated and added new sounds by C418
Added a sound for climbing up Ladders
New block-placing sounds: Wood, Stone, Plants, Sand, Gravel, although unintended by C418
New footstep sounds: Sand, Gravel, Soulsand, Grass Block, and Stone
New mob sounds: Cow, Pigs, Enderman, Zombie, and Skeleton
New tool sounds: Flint and Steel, Shears (when shearing sheep)
Lava and Flowing Water now have constant noise
Added level up sound, but will be changed later for a shorter one
Added a passive mob (Bat)
Spawns in dark caves
Sleeps during the day
Hangs on the ceiling when idle, starts flying when players come near
Added a hostile mob (Witch)
Throws splash potions of poison, slowness, weakness and instant damage at you
Regenerate health over time
Hold an empty bottle and rise their noses when attacking
Drink potions of instant health and fire resistance to defend themselves in combat
Rarely drop potions of instant health and fire resistance
Is immune to some splash potions
Does not spawn naturally (yet), but a Spawn Egg exists for it in Creative Mode
Command block target parameters have been upgraded, click here for details
Beacon artwork was changed
The beam of light was changed
Item Frames no longer despawn when 20 blocks away.
Wood blocks are now rotated differently. Instead of using the player’s position, it will rotate based on the face it is placed upon, like a lever (this is mainly a test).
Silverfish Source Blocks have a chance of spawning in caves

Client download : http://bit.ly/R2U5WM

http://media-mcw.cursecdn.com/thumb/e/eb/Face_of_Bat.png/800px-Face_of_Bat.png