This, with an occasional Throw Voice. Throw Voice is obviously a little more tricky to use, but once you get the hang of it, these two shouts make the defenses of any dungeon crumble.

And to those who were talking about it, yes, undead only works on undead, life on life, and other things, like robots, can't be seen with either. ALL can be seen with Aura Whisper, with a much larger range at that. The only downside to the shout is that creatures are all red instead of color coded for allies/enemies, but that's not much of an issue in practice. How often do you come across friendlies midway through a cave?

Doh! I missed 'Detect Dead'... I haven't even found that spell in game yet.

This is kind of a minor bug. The spell tome says "Detect Undead" but the spell says "Detect Dead".

And to someone else who commented on Detect Dead: I find it helpful for illuminating corpses of foes I've killed that are strewn all over the place, when I go back to loot after a battle.

I find myself almost always having it selected as my active power. I also have a 100 sneak, so it's pretty clear that I play sneaky characters. If I played a wandering warrior who charges every opponent, the usefullness would be greatly diminished. My only problem with the shout is that sometimes after using the shout and getting turned about, you don't know if you've taken out all the enemies or if your shout just timed out and you need to wait patiently for your bar to clear. Still, ignoring that pitance of a problem, it's a great skill and probably the shout that everyone hopes to find first.