Sounds quite interesting. Any chance of videotaping it? You could put it on your site, YouTube (though low res), or Zudeo, or democracy player, etc. I enjoyed watching video on my iPod of sessions I missed at YAPC::Asia, although the code projected on the screen was too small to see. Certainly a bunch of videos on interesting subjects in Perl could be a great way to introduce people to it.
By the way I did a survey of natural language parsing programs in Perl a while back just as an initial dip into it, but never actually had an opportunity to use those tools. I don't remember if it is Perl (a lot are Java but I think this is not) but have you used the uk program GATE and are you going to talk about that sort of thing (head parsing, automatic categorization/chunking, extraction of key noun phrases, etc.)? I am not familiar with the apps you are talking about but am quite interested in how to easily incorporate machine learning into my Perl systems.