Ok, so I've showed you blood spec, but what about Unholy?
Unfortunately, leveling can be pretty painful without at least 17 points in blood for butchery and vendetta, so I did this spec.
The results can be pretty impressive while AOE grinding. Here I showcase the power of the new and improved Death and Decay, in conjunction with Corpse Explosion (which now auto targets any usable corpse near you, thank god). In addition, all the mobs that I kill feed me 6% health and 20 runic power each. You can see how this can be incredibly useful for AOE grinding.
I also showcase Lichborne, Bone armor, Death gate yet again, and I summon a ghoul and have him leap to a target and explode for 2000 damage on some mobs.
Fun stuff. :)
Here is the vimeo link, and here is the high quality version available for download at filefront (~80MB).