Right now, most blood tanks don't take the Imp Blood Aura. However, all the other abilities that the blood tree provides does help the current tanking methodology. Basically, health and armor are it. All the other stuff is less important. So blood provides the best of those worlds.

Imp Blood Pres is actually in my spec on both Amuune and Obsy, for the simple reason that it allows me, while I am in Frost Presence, to still gain that 4% heal for the damage I do. That in itself is an excellent help to keep me alive, not to mention the Death Strike/Imp Death Strike.

Nice I did not know that DW was a viable option in blood tanking. After looking at your build especially for my gear I added the Imp Blood aura in my tanking and I really like it. It makes me just a little more survivable for my healer. Since I just ground out all the badges needed to buy every piece of DPS gear I can start working on my tank set.

DW isn't viable for blood right now. And I"m fairly sure it won't be viable in 3.3.3 either. Without getting the "You hit with both weapons on all your cool abilities" talent, you're not likely to do enough threat.

Actually Amuune has held aggro pretty well in heroics so far with her DW blood spec. So while it is less effective than other DK tank specs I wouldn't go so far as to say it's not viable at all.

Quazi is right, but I have also noticed an increase in damage to me so far, but I think that is due to the lower gear that I have right now. I am still working on badge gear and working on upping not only my avoidance, but my hit and expertise as well. Obsydiian is my just for fun DK, and I probably won't be tanking any actual raids anytime soon until I feel comfortable enough in my gear in doing so. It's more testing it out than anything, but I use Obsy because I don't want to screw up Amuune's specs. But I have been holding aggro rather well, and I am sure it will get even higher once I get my hit rating up more and tweak the expertise just a bit more. ^^ Obsy's avoidance is already at 50.05% unbuffed.

I won't say it is viable just yet, but I have been doing rather well so far. I think I will keep updating on my success or failure at DK blood DW tanking.