I've re-tested Attack Power coefficients for 3.0.8.9506, if you'd like to update your list.

Deathknight DK Attack Power coefficients - TankSpot

Most remain unchanged, but Corpse Explosion has gone up and Gargoyle Strike has gone down.

Does anyone have EP values for DW specs?

I put together a simple calculator based off of these stat weights.
Evaid.NET - World of Warcraft Gear Calculators

I'm currently planning a very big swoop of the article after 3.1 changes have settled down, I could start changing stuff now but I'd rather not do double work seeing how unstable these current announced changes are. I'll try and keep it better up to date after 3.1 too as my busyness seems to be settling down.

As of 3.0.8, Herbalism no longer provides a DPS buff based on consumables. The consumable was melee consumable, Fire Leaf, and the caster consumable, Fire Seed, had the underlying effects removed during BETA, but the tooltip and the ability to use the item did not get removed until 3.0.8.

Blue post confirming that the "on use" was being removed from Fire Seed
World of Warcraft (en) Forums -> Fire seed not working.

Armor Penetration Rating

Armor Penetration Rating is a bit of an odd beast for us.
It doesn't affect our damage from Diseases, Icy Touch, Howling Blast, Scourge Strike or Death Coil. This makes Armor Penetration have a reduced value for Unholy and Frost Specs. Blood however does have quite a lot of benefit from ArP Rating, due to the majority of it's damage being Physical.

We need 15.39 Rating to ignore 1% armor on our target.

First post ever! So is the above data accurate as of the release of 3.1 or is this not yet updated to account for the 25% increase DKs now receive from ArPen? Not trying to be a nag but I made a last-minute choice to take a Blood spec for my secondary DPS spec in raids (for those times when someone else is tanking) and I'm trying to gather as much good info as I can.

And am I correct that with the increase we'll now need 12.24 ArPen rating to equal 1% armor reduction?

Im sure you have been testing builds more than me, but about the unholy build you have linked, i have been testing it, and i do a lot less dps than with my pvp one: Talent Calculator - World of Warcraft

The improved unholy presence may come in handy at bosses where you need to move around a lot, but since there are tons of other bosses where you move just a little, or nothing at all, im not really sure about getting it. But you could improve your dps much more getting the master of ghoul (the pet will pack around 400-500 constant dps, and can get buffed by HoW and all other buffs) and ghoul frenzy instead (you can spend your death runes, and then blood tap and use it, to get around 100 more dps from your ghoul for 30 secs), so wouldnt a build like Talent Calculator - World of Warcraft do more dps?

Oh sorry, thougth it was updated, my fault XDD

Is anybody updating this for current patch or looking into 3.2?

I don't know what Illundai is planning - but I plan to update and improve this with help of others.

Guys it's completely just about outdated...comments like ArP not being important? hmmm methinks not Update from the author pls.