Another related post from PBX Tech at [url=http://www.dslreports.com/forum/remark,17558423~time=1169376995] BroadbandReports [/url]some of us might find interesting.  Warning:  This is a long one!

From [url=http://beta.worldofraids.com/burning_crusade/attunements/]worldofraids.com[/url]

Heroic Mode Keys

Auchenai Key (Everyone in the party needs this key to be able to play this heroic instance) 
Requires Lower City - Revered 
&quot;Unlocks access to Heroic mode for Auchindoun dungeons.&quot; 
Sells in: Shattrath City, Lower City 
Npc: Nakodu

Flamewrought Key (Everyone in the party needs this key to be able to play this heroic instance) 
Requires Honor Hold - Revered 
&quot;Unlocks Heroic Difficulty for Hellfire Citadel dungeons.&quot; 
Sells in: Hellfire Peninsula, Honor Hold (Alliance) 
Npc: Logistics Officer Ulrike

Key of Time (Everyone in the party needs this key to be able to play this heroic instance) 
Requires Keepers of Time - Revered 
&quot;Unlocks Heroic Difficulty for Caverns of Time dungeons.&quot; 
Sells in: Tanaris, Caverns of Time 
Npc: Alurmi

Reservoir Key (Everyone in the party needs this key to be able to play this heroic instance) 
Requires Cenarion Expedition - Revered 
&quot;Unlocks Heroic Difficulty for Coilfang Reservoir dungeons.&quot; 
Sells in: Zangarmarsh, Cenarion Refuge 
Npc: Fedryen Swiftspear

Warpforged Key (Everyone in the party needs this key to be able to play this heroic instance) 
Requires The Sha'tar - Revered 
&quot;Unlocks Heroic Difficulty for Tempest Keep dungeons.&quot; 
Sells in: Shattrath City, Terrace of Light
Npc: Almaador

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Attunements

Shattered Halls Key (5-man instance in Hellfire Citadel)

Only one person in your group needs the key to open the gate in front of Shattered Halls. Also, a level 70 rogue with 350 lockpicking can pick the gate. The quest to make the key starts in Shadowmoon Valley by killing Smith Gorlunk who is located on the Ata'mal Terrance of the Black Temple. He will drop a mold which starts the quest line to obtain the key.
Kill a Blacksmith orc called &quot;Smith Gorlunk&quot; outside The Black Temple, loot the (&quot;this-begins-a-quest&quot;) item &quot;Primed Key Mold&quot; from him and take: 
- Entry into the Citadel (Completes in Honor Hold for Alliance) 
- Grand Master Dumphry (Completes in Honor Hold for Alliance) 
- Dumphry's Request (4 Fel Iron Bar, 2 Arcane Dust, 4 Mote of Fire)
- Hotter then Hell (kill a Fel Reaver in Hellfire peninsula) 
Quest reward for the quest &quot;Hotter then Hell&quot; is the Key to Shattered Halls. 

Serpentshrine Cavern Quest Line (25-man raid inCoilfang Reservoir)

To get attuned for the Lady Vashj instance, you must enter the Slave Pens (level 62-64 Coilfang Reservoir wing) on Heroic Mode. Shortly after the first boss you will find Skar'this the Heretic captive in a cage. He will offer the quest &quot;The Cudgel of Kar'desh&quot;. For this quest you must retrieve an item &quot;Earthen Signet&quot; from Gruul the Dragonkiller (Gruul's Lair, 25-man raid) and a second item &quot;Blazing Signet&quot; from Nightbane (Karazhan, 10-man raid). After collecting these two items, you can return to him and he will cast a spell on you which will allow you to enter the Serpentshrine Cavern.

Shadow Labyrinth Key (5-man instance in Auchindoun)

Like The Shattered Halls, only one person in the group needs a key to allow everyone inside. The key for the Shadow Labyrinth drops from the final boss in Sethekk Halls (level 67-69 Auchindoun wing), Talon King Ikiss.

The Arcatraz Quest Line-Key (5-man instance in Tempest Keep)

Again like The Shattered Halls, you only need 1 key in the group or a level 70 rogue with 350 lockpicking. To obtain the key for The Arcatraz you must complete the Stormspire quest line in Netherstorm. Your quest will end you at A'dal in Shattrath City who will send you to get two pieces of the key and forge them together. The Bottom Shard of the Arcatraz Key drops from Pathaleon the Calculator in The Mechanar (level 70 Tempest Keep wing) and the Top Shard of the Arcatraz Key drops from Warp Splinter in The Botanica (level 70 Tempest Keep wing).
Questline: Starts in Netherstorm, Stormspire
- Triangulation Point one 
-- Triangulation Point two 
--- Full Triangle (elite) 
---- Special Delivery to Shattrath City 
----- Breaking in to Arcatraz (Completes in The Botanica and The Mechanar)

The Eye Quest Line-Key (25-man raid in Tempest Keep)

Everyone in the raid must have The Tempest Key in order to enter The Eye. There is no door to open but the key is rather a passive attunement much like the Drakefire Amulet. Once you complete the Cipher of Damnation quest line in Shadowmoon Valley you will recieve a letter from Khadgar in the mail asking for you to come talk with him. He will instruct you to talk with A'dal and you will then recieve three quests. Trial of the Naaru: Mercy - You must complete Shattered Halls (level 70 Hellfire Citadel wing) on Heroic Mode. Trial of the Naaru: Strength - You must complete Shadow Labyrinth (level 70 Auchindoun wing) on Heroic Mode. Trial of the Naaru: Tenacity - You must complete The Arcatraz (level 70 Tempest Keep Wing) on Heroic Mode. After completing all three trials you will be awarded The Tempest Key which allows access into The Eye.

Karazhan Quest Line-Key (10-man raid in Deadwind Pass)

Everyone in the group is required to have The Master's Key in order to enter Karazhan. The quest line for it starts right in front of the tower with a woman. She will give you two soloable quests which are done outside of the tower. You must then travel to Dalaran and speak with a mage on the northern side of the city. You will then receive a quest to get the First Key Fragment from a container near Murmur in the Shadow Labyrinth (level 70 Auchindoun wing). Once you complete that quest, you are then instructed to retrieve the Second Key Fragment from The Arcatraz (level 70Tempest Keep wing) and the Third Key Fragment from Steamvault (level 70 Colfang Reservoir wing). After you collect all three fragments you must complete the Opening the Dark Portal (Escape from Durnholde must be completed first in order to be able to enter the Opening the Dark Portal) inside the Caverns of Time to have Medivh complete the key.
Questline: Starts just outside Karazhan 
- Arcane Disturbances 
-- Contact from Dalaran 
--- Khadgar 
---- Entry Into Karazhan (Completes in Shadow Labyrinth) 
----- The Second and Third Fragments (Completes in The Steamvault and Arcatraz) 
------ Now, complete Black Morass in Caverns of Time and you'll get the key.

Mount Hyjal Quest Line (25-man raid in Caverns of Time)

This dungeon requires many pre-requisites: 

1. You must be level 70 

2. Complete Caverns of Time: Durnholde (Old Hillsbrad) and Complete Caverns of Time: Dark Portal (Black Morass). 

3. Talk to Soridormi (Adult) - the consort of Nozdormu. You may find her roaming around the clockwork in Caverns of Time. She will give you a quest titled: The Vial's of Eternity. 

However, this is no 1-2-3 immediate quest. To acquire the two vials of eternity requires the completition of many quest chains that will take months to accomplish and good gear. 

4. You must complete the Cipher of Damnation quest chain in Shadowmoon Valley and the Stormspire quests in Netherstorm. The Stormspire quest chain starts in Area 52 with the Consortium Ethereal. The chain ends when Nexus-Prince Harammad sends you to A'dal with a crystal. Maybe you should have talked to Akama at the Warden's Cage in Shadowmoon Valley. 

5. A'dal will give you the Arcatraz Key quest: The crystal key is divided in two halves. The first half is held by the last boss of Tempest Keep: Botanica - Splintertree. The second half is held by the last boss of Tempest Keep: Mechanar. Once you assemble the Arcatraz Key and have completed the two quest chains: Stormspire and Cipher of Damnation -- Khadgar will talk to you, asking you to talk to A'dal. A'dal will give you the Kael'Thas dungeon key chain quest. The key is named Tempest Key - for the final showdown with Prince Kael'Thas Sunstrider. 

6. Brace yourself - - you need to be revered with the Sha'tar Reputation faction to obtain the Tempest Keep Heroic-Dungeon key, Revered with the Lower City to obtain the Auchenai Key to unlock the Auchindoun Dungeons in Heroic-mode, Revered with the Cenarion Expedition to unlock the Heroic-mode for Coilfang Reservoir dungeons, and Revered with Thrallmar/Honor Hold to unlock the Heroic-mode Difficulty for Hellfire Citadel dungeons. Hope you have had fun reading this far. 

7. Complete Trial of the Naaru: Mercy; Trial of the Naaru: Strength; and Trial of the Naaru: Tenacity. No easy task ... for you have to complete the three trials in Heroic-mode. Trash mobs hit for 15,000 non-crit damage, no less. You have to kill Murmur in Auchindoun: Shadow Labyrinth, retrieve an unused Axe of the Executioner from Hellfire Citadel: Shattered Halls, Kalithresh's Trident in Coilfang Reservoir: Steamvaults, and to rescue Millhouse Manastorm (gnome) after killing the last boss of Tempest Keep: Arcatraz. Once you have completed those four dungeons in Heroic-mode, return to A'dal and he will grant you the Tempest Key to enter Prince Kael'Thas dungeon -- which requires 25 players. Kill Kael'Thas and loot his Vial of Eternity. 

8. Now you need to kill Lady Vashj and loot her Vial of Eternity. (Attunement to enter Lady Vashj instance)

9. By now you should be Friendly with the Scales of the Sands faction. 

10. Now you can enter Caverns of Time: Mount Hyjal 

In this dungeon you go back in time 4 years into the past to fight alongside Malfurion Stormrage, Tyrande Whisperwind, Thrall, and Jaina Proudmoore against Archimonde and the Burning Legion. Your mission is to stop the Infinity Dragonflight from altering time.