Annoyingly, I wrote that post much better on the train on the way home, but (as mentioned) the iPhone Wordpress app ate it. On the other hand, that version had a very long digression about how I got into writing Perl, which I suspect interests nobody except (possibly) me.
BTW, I notice with amusement that the course tutor has since spotted that I was tweeting about the course, though I'm not sure he knows it was me, if you see what I mean. Wouldn't be hard for him to find out now, though. :-)