I'm having difficulty in visualising how the NCCL hole-punching thing worked myself. You punch a hole in the file card and then shove a knitting needle through the pile to find all the cards punched in that particular spot? So, how does the knitting needle avoid the cards which are unpunched in that spot? Am I missing something or do you have Paul Daniels-esque knitting needles? And, if so, is keeping them away from the general public an infringement of our civil liberties?

And 'folksonomy' sounds more like something to do with sticking your finger inyour ear and singing about how you got on a boat at Liverpool and sailed away from your true love never to see her again rather than tagging.