One of the EDM group members is gearing up to sell handmade sketchbooks that look pretty interesting. She now creates handmade journals and such that look to be both beautifully made and inviting to use. Her name is Janice Hook, and her artwork is also very nice. She is having a little competition on her blog for winning one of her handmade books, by way of market research into what kinds of sketchbooks people like. All you have to do is mention the size and style of sketchbook you like to use. Pretty cool way to find out what she'll want to market.
Good luck if you decide to enter.