I myself am using this 0 / 31 / 40 dw spec. I myself think that 30% disease dmg is bit more important than 2% dmg increase from boneshield since the 3.0.8 patch. Also these dual wield specs needs loads of Hit rating and Expertise (that I forgot to mention earlier), so be sure you have 250+ hit rating and over 6 expertise (more the better in this build) also Crit rating over 20% is nice to have. But Hit rating and Expertise is much more needed than Crit rating at start.
My own variation doesnt care much about how long those diseases last, and focuses around pet also witch is important to keep up in boss fights. Also this is rather 1 target dps spec than aoe spec (only few bosses in Naxx has corpses of their adds near boss to use Corpse Explosion on for example, tho you can take CE and be and rule dps in trash mobs but lose dps on boss fights).
my own dps roll would be:
IT - PS - HB - BS - BS - DC DC (or gargoyle right away on boss fights without using Death Coil, to get it to cd fast so it can be used quite few times)
and second roll would be:
IT - PS - HB -IT - IT - DC DC (note that if you have gargoyle out, I suggest you only do 1 Death Coil before starting new dps roll again)
IT - Icy Touch
PS - Plague Strikes
HB - Howling Blast
BS - Blood Strike
DC - Death Coil
This would be spec I am using.
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Also I would suggest slow weapon on main hand and fast in off hand.
and as it comes to runes I would suggest using Razorice on main hand for constant +5% frost dmg and rune of fallen Crusader on off hand, since most of the spells your will be using here is Frost based dmg spells.
I hope someone finds this spec also as entertaining. I know it's almost the same as the one spec, but it has few diffirences (as in leaving boneshield, Corpse Explosion, Epidemic and Unholy aura away, but I myself like the benefit of 5% bonus dmg from Desecration since in boss fights such as Kel and Sapphiron there aint many corpses around to blow out. Also I find Epidemic not so important becouse the dps roll in this spec starts all over again before those runs out.)
Hope some may find this usefull
Note: this spec is taken from similar spec from WoW forums, althought I left out 1 point in Rime and boneshield to get 70% aoe spell resist in Night of the Dead talents for pet (witch ensures your pet will be up almost constantly in boss fights). The spec that I edited this from was 0 / 32 / 39 in old 3.0.2 patch. The person witch made spec that I tuned myself a bit is Ninlei, and can be found from Wow eu DK forums from topic: Ninlei's Dual Wield raid DPS VOL.2
So credits for making me tune this spec goes mainly to Ninlei.
There aint any similiar build to be found in Wowwiki yet, so this spec needs testers ^^
(Therefor I would name this as "DW Puppet Master" build becouse it focuses on your Ghoul, sorry Metallica :P)
Also I would reguest some feedback if theres something I didnt notice to tell here or there's something you want to change considering spec, runes etc.