http://www.ion.illinois.edu/IONresources/conferencing/activities.asp
Illinois Online Network (ION). Excellent list of activities to promote online discussions. Note link in #1 for examples of instructor bios; examples demonstrate personal, casual introductions using a "friendly", less formal method.
http://www.usdla.org/html/journal/JUL02_Issue/article04.html
USDLA Journal "Promoting Online Interaction in Today's Colleges and Universities" by Dr. Brent Muirhead of University of Phoenix. Includes useful suggestions for enhancing online interaction.
http://ts.mivu.org/default.asp?show=article&id=60
The Technology Source "Facilitating Knowledge Construction and Communication on the Internet" by Maggie McVay Lynch. Note especially section: Communication is the Key to Maintaining the Learning Community; advocates a lighter more personal approach.