Hungering Cold is amazing for PvP and PvE IMO. I am just running a 4 DK team to level at the moment as I already have 1 DK at 80 and am too lazy to get another character to 60 to level with them.

Despite not having a full group I hungering cold round robin every minute has let me complete both Hellfire instances at level without a 5th member and only with having one toon specced blood.

In PvP I tend to go in and blow a hungering cold early just to keep everyone in the same place and throw them off their guard/burn trinkets at the start of a fight. It is unbelievable that with 4 frosties we can pop this 10 second group freeze every 15 seconds continuously if we wanted to. I am only 64 at the moment and can't wait until 70 to see what howling blast feels like, because this team seems to be out of control at the moment even without a healer.

I have hungering cold, death grip and strangulate all set to round robin for use in PvP. I mainly use strangulate on the pesky mage that is immune to my death grip and is a pain in the ass to kill, whilst I kill his mates first. Once the target is in range of course mind blast locks them down nicely but ranged strangulate is really nice for support casters who pick your team off while you are killing your primary target.

Really enjoying this team at the moment, just wish I could skip the 55-80 grind and get into the real stuff :P