...If this clip is to believed, anyway (warning: gory, gory, gory):
This captures the endlessly difficult decisions that arise when battling Zombie Nazis. I'm not sure what the zombie transmission mechanics are for this film (virus, occult, etc.), but cutting off your arm is unlikely to help. And the other thing...well, goodnight.
Død Snø - or "Dead Snow" - is an official selection at this year's Sundance Film Festival. And even if it wasn't, I would be scouring the world for a copy. It looks incredible.