In the vein of getting to know your learner, I think getting the name right is very important.
In the online environment, we see the name listed in the courseroom. However, the learner may go by their middle name or a nickname.
I try to pay special attention to this during the introductions in Week 1. I keep a little list of those learners who use a nickname or different name than those diplayed.
This seems to be one way of showing that I care, and that I am paying attention to the learner's personal needs.