Show Your Face!
Indeed, one of the problems is that in DL classes you don't usually see the person with whom you are interacting.
The students don't see the professor.
The Professor does not see her/his students.
What to do?
Easy!
First, make images of yourself available. An easy way to do this is to open a Flickr account - http://www.flickr.com/ - and post some picture of yourself. Use images that may help the students understand you as a professional. Students can also open an account and post images of themselves -
Second, everyone has some sort of video camera or can borrow one for five minutes. Shoot a five minute or less introduction of yourself, create a "Group" or "Channel" on Youtube and post the short videos there. That way you will all at least gave a short mind map (a mental picture) of each other when you interact in the class. I have a coastal zone management group that will be used for my Coastal Politics and Policy class http://www.youtube.com/group/coastalzonemanagemen
Of course, the other way to do this is to use one of the many video enhanced communications tools such as Skype or Instant Messenger. In fact, this semster my TA Mike McCoy is Skyping with the students in a small course on Identity Theft Prevention we are teaching this semester. It works very well and it's also an excellent way to have "virtual office hours" with distance students.
If we are going to make distance leraning ever better and more exciting we must use all the tools of IT and enable our students to go there with us. I am certain that the future of distance education lies in making it as rich and diverse and engaging an experience as possible. Technology lets us do that.