4. Raids:
Icecrown Citadel (for obvious reasons)
Naxxramas (see above)
Blackwing Lair 

10. Zones of Azeroth
Uldum
The Jade Forest
Icecrown

14. NPCs
Nozdormu
Arthas
Leeroy Jenkins

16. Alliance racial leaders
Tyrande
Genn Greymane
Moira Thaurissan