Use the Internet for instruction if it suits your needs. It is a great idea for showcasing some instruction or demonstrating pioneering leadership. It is new and exciting. It is heading towards, but not yet mainstream.
Some interesting and valuable small scale studies can be conducted now. However, there is as yet little common methodology to Internet-based instruction. The findings with regard to one particular instruction would probably not apply to others. Research should still therefore be concentrated on the underlying foundation - CAI.
Internet instruction is an exciting field on top of a revolutionary communications network. It will be interesting to see if future instruction can fully utilize the depth of the internet resources.