This thread is a little old, but it's interesting. I don't post much, but thought I would in this one.
In our dojo, the instructor is always called sensei--no exceptions. When bowing in seiza, we put our left hand down first, then the right. When rising from the bow, we raise the right hand first, then the left. When moving into seiza from hanmi, we put our left knee down first, then the right. When standing, we raise the right knee first, then the left.
When walking off the mat with a weapon, we back away--never turning our backs to the shomen.
Lots of little points of etiquette allow the mind to string together continuous attention and give us a common nonverbal language. At the same time, the spirit in our dojo is very light. There is a lot of laughter, no drama, and we are all devoted to one another. We train rigorously in a clean, uncluttered style with lots of martial directness. It's a great place, and I think the etiquette is one of the things that makes it so.