The show was a treasure trove of ideas, but the one I found most interesting and potentially useful was this: Before marking fabric, put it on some fine grit sandpaper. The sandpaper helps keep the fabric from slipping about and marking is both easier and more accurate.
I am here to tell you, it's the plain and simple truth. I might actually come to enjoy marking fabric, it's so much less frustrating. Well, not hate it quite so much, anyway.