There is an abundance of papers and articles available in this area. You may want to narrow your search by focussing on a specific aspect of learning or a particular group of learners. You may want to look at Somekh and Davis' book: Using Information Technology Effectively in Teaching and Learning
You may find something of interest in the following Web sites:
The Online Report on Pedagogical Techniques for Computer-Mediated Communication
http://www.nettskolen.com/pub/artikkel.xsql?artid=123
Community College of Aurora
http://www.ccaurora.edu/facstaff/resources/online/getting_started.html
Guidelines of Best Practices for Delivering Quality Online Instruction
http://asuonline.asu.edu/support/pdf/DistanceGuidelines.pdf
Communication Technologies and Education : Lessons in the Potential of Innovation.
http://www.leeds.ac.uk/educol/documents/000000462.htm
Electronic-conferencing: promoting a collaborative community with learning opportunities for developing teachers.
http://www.leeds.ac.uk/educol/documents/00001374.htm
Hi Conrad
Gilly Salmon's site about strategies for online learning has some useful stuff on it.
Hazel