Listed are mods Nocturnal uses:
 
Mandatory
Ventrilo - Voice communications, esp for raids
Omen - Threat meter, better than ktm
oRA2 or CTRaidAssist - MT windows, Raid messages, voting and warnings
Forecast - Healers only - Shows spells that are being cast on your target, helps limit overhealing
Deadly Boss Mods - Mod for showing Boss abilities and timings
 
Optional
Recap - Damage meter, the more use the more sync and accurate it is
X-Perl UnitFrames - Clean crisp party and raid windows, customisable, simply awesome