General Info
A lot of casters lose a big chunk of their DPS to lag. This is quite unnecessary with the engineering changes Blizzard made some time ago. Basically, you can spam a spell's button and it will be sent to the server whether your current spell is finished casting or not. So the server will use the earliest possible button press. If you are waiting for your cast to finish before pressing another button you are losing huge amounts of dps.
Affliction Warlock
Talents
Gear
As with most casters, your first priority is to get 11% hit. After that you can start gemming for Haste in yellow slots.
Instructions
Life Tap>Shadow Bolt>Haunt>Corruption>Unstable Affliction >Curse of Agony
Start with Life Tap to activate glyph. Follow with Shadow Bolt to apply the first stack of Shadow Embrace and then Haunt to provide the second stack as well as give the damage modifier to DoTs. Then put up your DoTs. After that you will be using Shadow Bolt as filler ensuring to refresh your DoTs as needed as well as casting Life Tap to keep up the buff from the glyph.
Under 25% you will be in execute phase and will replace Shadow Bolt with Drain Soul as your filler spell.
Keep in mind that you must use Curse of the Elements instead of Curse of Agony if you don't have any moonkins or unholy death knights in the raid. However, either of those can apply the debuff for free, so you should let them do it and use your Curse of Agony.
Haunt and Distance to target
One thing to pay close attention to is the travel time of your haunt. If you are standing a long way from the boss, or the head is way up in the air, haunt will take a long time to reach its target. You should adjust when you cast it; you may even need to cast it as soon as it cools down to maintain better uptime.
Destro Warlock
EJ forums on Destro until one of us lazy folks writes one.
Demo Warlock
{Coming Soon}