Raiding BC can be painful with the long quest-chaining attunements as well as the 10 man composition required for Karazhan.  Most advanced raiding guilds have at least one team inside Karazhan and many guilds have multiple teams.  What can be the most frustrating is getting your entire guild on the same page with what goals they are required to work towards.
With that in mind I decided to create a checklist for raiding guilds to make management of a guild-wide attunement effort much easier.  
Step 1 - Karazhan Attunement 
   Initial quest near Karazhan (starts at level 68, solo)
   Completion of Shadow Labyrinth (puggable)
   Partial completion of Steamvaults (puggable)
   Partial completion of Arcatraz (requires level 70 and flying mount, puggable)
   Completion of Black Morass (guild effort, challenging pug)
   
http://www.ampwow.com/wow/viewnewzones/ ... ult=attune
Step 2 – Serpentshrine Attunement Quest (Everyone must complete)
   Revered Reputation with Cenerion Expedition (solo quests, grouping through SV)
   Heroic Slave Pens, Quest giver in between first and second boss
   
http://www.ampwow.com/wow/viewnewzones/ ... ult=attune
Step 3 – To Summon Nightbane (Only one person required to summon)
   Revered Reputation with Honor Hold
   Revered Reputation with Lower City
   Quest line in Karazhan
      Partial completion of Heroic Shattered Halls
      Partial completion of Heroic Sethekk Halls
      
http://www.ampwow.com/wow/viewnewzones/ ... ult=attune
   
Step 4 – Serpentshrine Attunement 
   While the quest from Slave Pens is active…
   Completion of Gruul’s Lair
   Completion of Karazhan
   
http://www.ampwow.com/wow/viewnewzones/ ... ult=attune
Step 5 – Tempest Keep Attunement
   Completion of Cipher of Damnation quest series in Shadowmoon Valley
   Revered with Cenerion Expedition
   Revered with Sha’tar
   Revered with Honor Hold
   Revered with Shadow Labyrinth
   Completion of Heroic Steamvaults
   Completion of Heroic Arcatraz
   Completion of Heroic Shattered Halls
   Completion of Heroic Shadow Labyrinth
   
http://www.ampwow.com/wow/viewnewzones/ ... ult=attune
Step 6 – Mount Hyjal Attunement
   Completion of Black Morass Quest
   Vials of Eternity quest in Caverns of Time
      Completion of Serpentshrine Caverns
      Completion of Tempest Keep
   
http://www.ampwow.com/wow/viewnewzones/ ... ult=attune
The most useful thing that I’ve found with the attunement process is that there is always something to do.  While some of your guild may be inside Karazhan, other players can work towards other necessary attunement quests while getting better gear along the way (such as Heroic dungeons).
The biggest detriment is that the attunement process is long and because of the reputation requirement, guild mates that are new to 70 may lack the reputation required to gain access to Heroic dungeons.  Because of the difficulty shift in the 5 man dungeons, guild mates are much less motivated to pug a group.  It takes a lot of effort and a great deal of patience for a guild to stay tightly knit through the initial raids in Burning Crusade.
Other tools…
In regards to “gearing up” there’s a tool that you can go to check your class’s talent pool and find the appropriate gear be it rare or epic.  This has been a useful reference when I’ve told my guild mates to research their upgrades.
http://www.ampwow.com/wow/viewClassItems 
On a similar note you can also visit any dungeon or raid drop page here and filter by your own class to see what may be useful to you specifically.  An example in Karazhan can be found here:
http://www.ampwow.com/wow/viewnewzones/ ... ault=drops 
Good Luck and I hope your guild progresses quickly.
Neggie – Bamboozled - Skywall