May not even be litterally "now", for that matter. I'm not really exhausted, but I could certainly sleep now. Question is whether I can get any useful amount of work done in the hour or so before I really should sleep (pause in here)... I think the sandman will win this argument.

Not particularly satisfied with the talk, but it does give the basics... it's more of a philosophy lecture, or even a comp-sci lecture than a tutorial at the moment... but then we don't really have time for a tutorial in 15 minutes... and most people don't have computers to work along on anyway, so maybe a quicky philosophical overview is the right approach. We'll see.