I think I’ve found several weeks’ worth of reading material about online teaching: the website of the Online Learning Consortium looks very promising. For example, this report on Virtual Classroom training focuses on the components a good training programme for instructors should have – and what it usually includes in reality. Apparently, too little attention is given to the real experience in the virtual classroom (as a student and as a trainer) and too much to the technological side of things. The authors also urge to pay more attention to the pedagogy of online synchronous learning and how it – and the materials – should be adapted to the new medium. Interesting!
P.S. Note that the materials there are behind a registration form; so far it hasn’t turned into a paywall, but I have opened only a few reports.