I suggested in another thread that when NPCs (like bandits, for example) spot one of their own men lying dead on the ground, they should be searching for the player until either:
1) They find you
2) You kill them
3) You leave the area
It's absurd that they'll spot the body, say "I'm going to find whoever did this!" but then proceed to sit in a chair and nibble on some bread. That takes ADD to a whole new level.
And then players would have to think about dragging corpses away from view, a la Metal Gear Solid, which would make stalking bandits a bit more interesting.