WowAce

Alternate Power- and Combopoint/SoulShard/HolyPower-bar

Necronomicon2

eeShards

Displays Pet Info for Hunters and Warlocks. Also keeps track of Stables and Pet and Demon skills.

DarkCandy

FuBar_ShardCountFu

Acolyte2

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

Shows current/dot cast haste values

A simple addon that warns you if your pet isn't attacking while you're in combat.

A 'channeling spell'-tracking addon for Affliction Warlocks. Drain Soul, Drain Life/Harvest Life and Malefic Grasp.

Reminds you to Life Tap and Dark Pact

Shows a nice Soulstone Monitor.

Fubar Plugin for Simple Soulstone

Show a bar indicating the unit's Soul Shard count.

Destruction Warlock priority module for clcInfo -- Maighurl

Show a bar indicating the unit's Burning Embers count.

Tracks if the target does NOT have the tracked DOT.

EasyPet

CurseBar