I didn't manage to get to his presentation; this, like the conversation with the Rowling fans (including that grandma) was an evening conversation when people were just hanging out eating/drinking. Professor Rudski has given me his e-mail address and says his paper is likely to be published in an academic journal, so I'll post again if I find out more. A shame you couldn't come! I'll let you know if I find out more. I do think you would have enjoyed it, and we did a fair bit of hiding out in the hotel room - but the people made the conference, for me, and most were very friendly and welcoming.