Have you ever seen those warlocks doing 100k+ plus more damage than you in battlegrounds? I know the first time I saw it I thought they were glitching or using some kind of exploit. Untill I talked to one of them and figured out their tricks. Its basically all about their talent build and some general strategies. Disocver their secrets...

The affliction tree is the warlocks main source of high damage over time and their incredible soloing abilities. Here's the build I got from one of those amazing warlocks dishing out rediculous damage in a Arathi Basin I was in:

Levels 10-14 - Improved Corruption (5/5)

Levels 15-19 - Improved Drain Soul(2/2), Soul Siphon (2/2), Improved Life Tap (1/2)

Level 20 - Amplify Curse(1/1)

Levels 21-25 - Improved Curse of Agony (2/2), Improved Life Tap (2/2), Suppression (2/5)

Levels 26-27 - Grim Reach (2/2)

Levels 28-30 - Empowered Corruption (3/3)

Levels 31-32 - Nightfall (2/2)

Level 33 - Siphon Life (1/1)Great for gaining back some health

Levels 34-35 - Suppression (4/5)

Levels 36-40 - Shadow Mastery (5/5)More shadow damage

Level 41 - Dark Pact (1/1)700 free mana

Levels 42-46 - Contagion (5/5)

Levels 47-48 - Improved Howl of Terror (2/2)

Level 49 - Curse of Exhaustion (1/1)

Level 50 - Unstable Affliction (1/1)

Levels 51-55 - Improved Shadowbolt (5/5)

Levels 56-60 - Bane (5/5)

Level 61 - Shadowburn (1/1)

Levels 62-66 - Demonic Embrace (5/5)

After 66 you can put more points into destruction for the added damage.

Here's a great warlock talent guide

Demonology focuses on improving the warlocks pet skills, abilities, and overall stats. Its a very good tree to go into depending on your preferences.

Levels 10-11 - Improved Healthstone (2/2) More health from your healthstone

Levels 12-14 - Demonic Embrace (3/5)

Levels 15-16 - Improved Health Funnel (2/2)

Levels 17-19 - Improved Voidwalker (3/3)Make your voidwalker all kinds fo buff

Level 20 - Fel Domination (1/1)

Levels 21-23 - Fel Stamina (3/3)

Level 24 - Fel Intellect (1/3)

Levels 25-26 - Master Summoner (2/2) The less mana you use summoning means the faster you can get out there and get experience/honor

Levels 27-29 - Unholy Power (3/5)

Level 30 - Demonic Sacrifice (1/1) This is down right amazing. There's so much you can do with it.

Levels 31-32 - Unholy Power (5/5)

Levels 33-34 - Fel Intellect (3/3)

Levels 35-39 - Master Demonologist (5/5)

Level 40 - Soul Link (1/1)

Levels 41-43 - Demonic Knowledge (3/3)

Level 44 - Demonic Resilience (1/3)

Levels 45-49 - Demonic Tactics (5/5)

Level 50 - Summon Felguard (1/1) Awesome pet

After 50 you can go for either affliction or destruction. Just depends if you like to nuke or DoT.

Here's a great warlock talent guide

The destruction tree improves your offensive direct damage spells like shadowbolt, searing pain, and immoliate. I myself would rather let the mages deal with the direct damage but some warlocks like this for the quick kills instead of waiting for their DoTs to do the work.

Levels 10-14 - Improved Shadowbolt (5/5)

Levels 15-19 - Bane (5/5) Shorter cast time for destruction spells

Level 20 - Shadowburn (1/1) Nice nuke

Levels 21-25 - Devastation (5/5)Higher crit rate is always good

Levels 26-27 - Destructive Reach (2/2) Longer casting range and less threat

Levels 28-29 - Improved Searing Pain (2/3)

Level 30 - Ruin (1/1)100% increased crit rate

Level 31 - Improved Searing Pain (3/3)

Levels 32-36 - Improved Immolate (5/5)

Levels 37-39 - Emberstone (3/5)

Level 40 - Conflagrate (1/1)

Levels 41-42 - Emberstone (5/5)

Levels 43-45 - Backlash (3/3)

Levels 46-50 - Shadow and Flame (5/5)

Level 51 - Shadowfury (1/1)

After 51 I would start putting points into demonology unless you don't like fighting with a pet then go for affliction for added damage.

Here's a great warlock talent guide

0/21/40

DESTRUCTION

Tier 1

Improved Shadow Bolt 5/5

Tier 2

Bane 5/5

Tier 3

Devastation 5/5

Shadowburn 1/1

Tier 4

Intensity 2/2

Destructive Reach 2/2

Tier 5

Improved Immoliate 5/5

Ruin 1/1

Tier 6

Emberstorm 5/5

Tier 7

Backlash 3/3

Conflagrate 1/1

Tier 8

Shadow And Flame 5/5

DEMONOLOGY

Tier 1

Demonic Embrace 5/5

Improved  Healthstone 2/2

Tier 2

Fel Intellect 3/3

Tier 3

Demonic Aegis 3/3

Fel Stamina 2/3

Tier 4

Unholy Power 5/5

Tier 5

Demonic Sacrifice 1/1

At level 70 warlocks are downright awesome at PvP. Fear will mess with people so much it will make them want to back out of a battleground. Or even being charmed by a succubuss can be really annoying. But what about raiding and high end instances? How do you get into those? Warlocks aren't exactly the most wanted class for these situations. Here's a guide that will make you wanted more than a healer:

Here's the best warlock guide I have found yet.