This handbook has lots of tips for teaching on-line. In particular, it notes the importance of timely feedback by the instructor, the importance of tone and using more informal discourse. Additionally, it mentions the possible use of an on-line meeting place called “the virtual conference room” where “students post comments and findings after completing activities related to the course content (umass.edu).” This helps reduce isolation, keeps learners on task and gives instructors insight into what is and isn’t working in the course.
Sounds like a great idea to implement.