Klein 10-in-1 screwdriver.
Minimag flashlight (2AA)
Fluke volt-tick.

When snaking wires, I like to have a really long (12" or more) 1/8" twist drill. Handy for predrilling holes to check for location/obstacles before breaking out the big drill.

If it accidentally breaks through a plaster wall or something else, at does much less damage.