Rules to Tack Sharp Portraits

Someone posed the question on Flickr today, asking my thoughts on getting tack-sharp photos.  Well, my theory is pretty simple, but would love to hear your thoughts as well:

1. Tripod. No matter what.
2. Sharp lens at it’s sweetest spot. (I like the Carl Zeiss 85mm @ f/4 range – give or take a bit)
3. Tripod.
4. Wired or wireless trigger. Again, remove all chances of shake.
5. Lock up the mirror prior to the shot. Reduces a minute amount of shake.
6. Tripod.
7. Focus on the eyes.
8. Did I mention a tripod?
9. Lighting can always help to keep the shutter fast, giving your subject less chance to flinch.
10. Damn, don’t have a #10. Let’s throw in the tripod again.

What do you think?