Arachnophobia!

Mutes in game spider sounds.
WoWInterface

AudioX II Eisa

AudioX provides players with the ability to explore 33,481 World of Warcraft sound samples. It also allows you to exchange samples with other AudioX users via chat hyperlinks.
WoWInterface, Curse

Dungeon Ready Sound xplosive03

This is a simple addon that will allow you to hear the dungeon ready sound when wow is minimized. So you can browse the internet or do whatever you like while waiting and never miss any dungeon again! Battlegound is also supported!
WoWInterface

EpicMusicPlayer yess

Multiple play lists, link to songs not in the WoW directory, a little 3d dancing model, FuBar and Titan plugins, WoW music included in a play list.
Curse

Hear Kitty VgerAN

Hear Kitty plays soothing and distinct orchestral sounds as you gain and spend your combat resources.  It's like having your own theme music!  Rogues and feral druids hear tones as they gain and spend combo points, enhancement shamans hear their maelstrom weapon charges, and paladins hear their holy power build up.  When you hear the final note played, you'll know it's time for a finishing move, and you won't have to watch for red combo dots or buff stacks anymore.
WoWInterface, Curse

Jobs'a'Goodn Slakah

After a hards day questin' this mod will give a little peon soundbite when you complete a quest or an objective.
WoWInterface

Mangle Sound Remover

Blanks out the Mangle sound effect from playing in game so any abilities that use it (e.g. Mangle, Mortal Strike, Crusader Strike, Templar's Verdict) won't play it anymore. All you'll hear when you use the ability is the "woosh" sound of the weapon swing.
WoWInterface

Mute Annoying WoW Sounds kiingz

Mutes some of the annoying sounds of WoW.
WoWInterface

Muted Sounds - All sp00n

This file removes all sound files from the game so that you can clearly hear your addon sounds.
It affects all* sound files in game so you won't hear things like UI clicks or ready checks or boss speeches anymore. Addons that play their own sound files sill work though.
WoWInterface

Muted Sounds - Combat Only sp00n

This file removes all combat sound files from the game so that you can clearly hear your addon sounds (and also boss speeches!). It doesn't affect other sound files in game like UI and other stuff (although some mounts/pets might be affected if they share sound files with those used during combat).
WoWInterface

QuestSounds Kerenon, Yocote

Plays a sound when you complete a quest or a quest objective.
Curse, WoWInterface

QuietMounts

Removes the annoying sounds from the following mounts: Mekgineer's Chopper, Mimiron's Head, Turbo-Charged Flying Machine Control, Celestial Steed, Goblin Turbo-Trike
WoWInterface

Shut Up! Celestial Horse

Silences the jumping and damage noises of the Celestial Horse.
WoWInterface

Silent XT

Silences the Lil' XT pet.
WoWInterface

Sound Commands - Cataclysm

Zip that contains a text file that lists the /script commands to play almost any sound in game. If it was in the MPQ files then there should be a /script command to play it. From 25 man raid bosses to the sound a Gnome Male makes when dying. Also included instructions on how to do this yourself.
WoWInterface

Worgen Transform Mute (Human)

Mutes the Worgen transformation sounds when transforming back into human form.
WoWInterface

Worgen Transform Mute (Worgen)

Mutes the Worgen transformation sounds when transforming into worgen form.
WoWInterface

 
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