This was at The Chronicle, so it'll probably be popping up on a lot of sites.
With tongue firmly in cheek, I offer this view about technology. Rule #1 of technology use (even before "what pedagogical purpose does it serve?") is that you have to be stronger than it is: mind over matter. If you're weak, it senses your weakness and refuses to work. A video clip won't play? A program freezes while the class sits and stares at you with amusement? You know what I'm talking about.