Updated for Wrath of the Lich King.
Here is the list of Class Leaders
Death Knights - Abhorred
Druids - Obrox
Hunters - Bloodtracker
Mages - Fatalelement
Paladins - Akaichisuru
Priest -
Rogue -
Shamans - Junone
Warlock - Emiran
Warriors - Nurgle
Raid leaders -
Edtheundead (warrior)
Morzalock (mage)
Blaniam (druid)
Tsizzles (druid)
Wrothrok (warlock)