Looking at the Affliction tree for Warlocks at 70, its seriously fun times. The tree has gained some potentially powerful spells, and the opportunity is present for Affl-Locks to construct strange and bizarre spell rotations. Much like the Paladin build earlier I’m taking a punt on a build. This setup was copied from a L80 setup for Afflict raiding, and I can see easily why its potent.
Edit: As 3.1 is fast approaching, consider this spec out of date. I’m sure the basics will be ok, but I’m not claiming this is accurate anymore.
For this one I basically agreed with the folks who created it – to dump almost every point in Affliction. The only exception is Bane as I can still see faster SB being handy. However if 5 talent points need to be spent elsewhere then Grim Reach (2) and Fel Concentration (3) are the other option.
I suspect that the deep Afflict’s Haunt is a “to be tested” ability that I’ll have to learn to use. It appears useful initially and something that Shadow Priests might be able to comment about given they have a little shadow pet for mana return.
For leveling I’m not so sure, as Pet threat and a free Tank will be had to resist in Demo, but for long-ish fights in raids, this should be rather snappy.
TyphoonAndrew's - Eye of the Storm 
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I tried a new build for 80s that gives some damage increase from the destro tree and includes the buffs from the demon tree but still goes all the way to haunt.
I may try this out and see how it works. I could be interesting. While playing with Haunt, I find myself with more life than before and my mana taps dont leave me vulnerable after 4 and 5 mob kills.
http://talent.mmo-champion.com/?warlock=050000000000000000000000002350022001023510053510331351000000000000000000000000000