This is my guide to how to play as an endgame Demonology warlock using the metamorphosis spec. This is a narrated youtube HD video. This spec is not the top DPS warlock spec but it gives 10% of your spell power as a buff to the raid. This will be greater than 400 SP for a ToC25 geared warlock.
Enjoy: http://www.youtube.com/watch?v=ieGnHENE7JQ
Talent Spec: http://www.wowhead.com/?talent#IZ0GchkAbihsgdAoE00V:Tno
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I'm adding this here because it's an extremely good video made by one of the best hunters in the world. The advice he gives applies to all dps classes.
http://www.youtube.com/watch?v=VgDjG_0ecTI
Everything in this video applies to you. Move smarter. Know what you are going to do before you do it. Stack your cooldowns with procs. Never stop casting.
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The macro below is mentioned in the video. It pops demonic empowerment and any use trinkets you have. Replace 'Shadow Bolt' with any spell you want to cast. You can also choose whether or not you want the metamorphosis transformation in it as well. The rest of the macro removes error messages and sounds.
#showtooltip Shadow Bolt
/console Sound_EnableSFX 0
/petattack
/use 13
/use 14
/cast [pet:Felguard] [pet:imp] Demonic Empowerment
/cast Metamorphosis
/script UIErrorsFrame:Clear()
/console Sound_EnableSFX 1
/cast Shadow Bolt