Since Snot volunteered me I'm starting up this post for people to post what they have and what they need.  :)
The ultimate goal being Karazhan, here are the instances (only) that must be done.  Just post below each key you need and what step you're on.

Karazahan
To gain entry you must...
Step 1: Obtain key fragment from altar in Shadow Labs
Step 2: Obtain key fragment from altar in Steamvaults
Step 3: Obtain key fragment from altar in Arcatraz
Step 4: Obtain key from Medhiv in Black Morass
Steps 2 & 3 can be done in any order

Shadow Labs
To gain entry you must...
Step 1: Obtain key from Talon King Ikiss (last boss) in Sethekk Halls

Arcatraz
To gain entry you must...
Step 1: Obtain key fragment from Warp Splinter (last boss) in Botanica
Step 2: Obtain key fragment from Pathaleon the Calculator (last boss) in Mechanar
Steps 1 & 2 can be done in any order

Black Morass
To gain entry you must...
Step 1: Complete Old Hillsbrad and associated quest

Karazhan
Need Step 1 (Shadow Labs)

Shadow Labs
Completed

Arcatraz
Completed

Black Morass
Need Step 1 (Old Hillsbrad)

Edited by Velethas at July 11th, 2008 - 5:27 pm

Edited by Velethas at July 17th, 2008 - 12:03 pm

Karazahan
Step 4: Obtain key from Medhiv in Black Morass

Shadow Labs Key
Done (can open Shadow Labs door)

Arcatraz Attunement
Done (can enter Arcatraz)

Black Morass Attunement
Done (Can enter Black Morass)

Edited by Vigoratus at July 14th, 2008 - 10:37 am

Edited by Vigoratus at July 16th, 2008 - 10:25 am

Karazahan
To gain entry you must...
Step 1: Complete
Step 2: Complete
Step 3: Obtain key fragment from altar in Arcatraz
Step 4: Obtain key from Medhiv in Black Morass
Steps 2 & 3 can be done in any order

Shadow Labs
To gain entry you must...
Step 1: Complete Still have a quest there, so eager to go back.

Arcatraz
To gain entry you must...
Step 1: Obtain key fragment from Warp Splinter (last boss) in Botanica
Step 2: Obtain key fragment from Pathaleon the Calculator (last boss) in Mechanar
Steps 1 & 2 can be done in any order

Black Morass
To gain entry you must...
Step 1: Completed OHB

Edited by Grayblood at August 6th, 2008 - 2:29 pm

Edited by Savesamurloc at July 11th, 2008 - 6:37 pm

Edited by Savesamurloc at July 11th, 2008 - 6:38 pm

Edited by Savesamurloc at July 11th, 2008 - 6:39 pm

Edited by Savesamurloc at July 16th, 2008 - 7:41 pm

Karazhan

Step #1 (done): Entry Into Karazhan for first key fragment (Shadow Labyrinth)
Step #2 (done): The Second and Third Fragments for the second key fragment (Steamvault)
Step #3 (done): The Second and Third Fragments for the third key fragment (Arcatraz)

Arcatraz

Step #1 (done): Prequest (How to Break Into the Arcatraz)
Step #2 (need): Top Shard of the Arcatraz key
Step #3 (done): Bottom Shard of the Arcatraz key

Black Morass

Step #4 (done): Take apprentice's key to Medivh in Black Morass

To get the key to Arcatraz you should be on quest: How to Break Into the Arcatraz. The prequest to be on that quest is chains Assisting the Consortium and Warp-Raider Nesaad.

FF

Edited by Zargous at July 16th, 2008 - 11:00 am

Edited by Zargous at July 30th, 2008 - 11:28 am

Karazhan
Step 1: Obtain key fragment from altar in Shadow Labs

Shadow Labs
Step 1: Obtain key from Talon King Ikiss (last boss) in Sethekk Halls

Arcatraz
Step 1: Obtain key fragment from Warp Splinter (last boss) in Botanica

Black Morass
Done (need Black Morass)