FailBot 

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I have recently quit raiding and will soon be quitting WoW altogether, so I will no longer be able to maintain and update this project. I suggest checking out EnsidiaFails for a proper replacement:
http://wow.curse.com/downloads/wow-addons/details/ensidiafails.aspx
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Add some public humiliation to your raid! FailBot reports in raid chat (or another channel of your choosing) whenever a raid member "fails." These fails are only things that are preventable by the individual on a consistent basis, so if someone's name pops up it was irrefutably their fault, which makes it a great way to see who in the raid needs to improve without having to personally call them out.

/failbot or /fb in game to configure.

Fails include:

(Naxxramas)
Hit by an eruption on Heigan
Dying to slimes after Patchwerk
Missing the jump on Thaddius
Crossing 3 or more opposite charges on Thaddius
Hit by a frost breath on Sapphiron
Hit by a void zone on Kel'Thuzad

(Sartharion & Drakes)
Hit by a void zone on any of Sartharion's drakes
Hit by a lava wave on Sartharion

(Ulduar)
Hit by Devouring Flame on Razorscale
Spell school interrupted by Ignis the Furnace Master's Flame Jets (Note: Sometimes the game will generate a combat event for someone's spell school being interrupted when they just barely avoided it)
Letting XT-002 Deconstructor's Light Bomb get 3 or more damaging ticks off on nearby players
Letting XT-002 Deconstructor's Gravity Bomb detonation hit 2 or more players
Hit by Stormcaller Brundir's Overload on Iron Council
Hit by Kologarn's eyebeams
Hit by the void zone that Auriaya's Feral Defender leaves behind when it dies
Hit by Flash Freeze on Hodir
Hit by Runic Smash on Thorim's gauntlet run (hallway shockwave effect)
Hit by Lightning Charge on Thorim
Dispelling Bind Life buff on Freya's trash
Spell school interrupted by Elder Stonebark's or Freya's Ground Tremor (Note: Sometimes the game will generate a combat event for someone's spell school being interrupted when they just barely avoided it)
Hit by an exploding Sapper on Mimiron's trash
Hit by Rocket Strike, Laser Barrage, Shock Blast, Bomb Bots, or a Proximity Mine on Mimiron (Note: Bomb Bots are not always a failure depending on your group's strategy, you may disable it from the options menu)
Hit by ground flames on hard mode Mimiron
Hit by Shadow Crash on General Vezax or his Faceless Horror trash
Receiving too many stacks of General Vezax's Saronite Vapors
Hit by Death Ray (green beam) on phase 2 of Yogg-Saron

TO DO:
Add a command to report overall fails to chat channel.
Figure out a way to report when someone receives 3 stacks of Hodir's Biting Cold. (Need a more experienced coder to assist me in adding this, please contact me by leaving a comment here if you can help - I usually overlook PMs.)
A raid member (in same zone) NOT getting hit by Auriaya's Sonic Screech. (Again need assistance here.)
When people fail at the various Flame Leviathan hard mode obstacles, unsure if there's a way to determine which player owns the vehicle hit by spells. (Again need assistance here.)

CAN NOT DO:
Report who walks into a cloud on Yogg-Saron, the game does not generate a combat event for clouds except when an add actually spawns.