What is the best dugeon spec for deathknights?

Answer 1

By far blood, it's very fun to tank, and doesn't require much skill. Tanks also get good dps, so you'll be up on the charts. Just remember if you're using the blood spec, that you need to do moves that cause aggro, or threat. Which would be:

Death and Decay

Runestrike

Deathstrike

When you're about to run up to a mob, lay down Death and Decay.

If your aggro isn't good enough, and mobs start to flee and attack other players, pull them back with the aggro moves.