I followed the link about treadle sewing machines from Ricky's recent magazine article. It would be interesting to have a short segment on those- there seems to be a community of treadle fans, with some people who have written books, etc. And/or, how to get one working - I picked up a gem at an auction, but am nervous about trying to get it to work, so it just sits as a lovely table in my sewing room.
That brings to mind another topic idea: routine maintenance on machines (in general, not just treadles). I know each machine is different, but cleaning and oiling are universal. It would be a nice reference to have a visual of how to maintain.
Which brings up yet another idea... Just how does a sewing machine work? I wish I knew how the needle and thread magic happens. Might help me understand why bobbin tension is so important - I'm always struggling with that.
Any other ideas?