Here's a pretty interesting summary of some different research into the affects of online learning. It goes over several strong points and leads finally to the question of whether it's OK not to use CALL. Maybe we're doing a disfavor to our students if we don't get them involved. Maybe online English is a different beast.
Kern, R., Ware, P., & Warschauer. M. (2004). Crossing frontiers: New directions in online pedagogy and research . Annual Review of Applied Linguistics 24, 243-260.
http://www.gse.uci.edu/faculty/markw/frontiers.pdf
What do you think?