Is it a paper or electronic shopping list? I've thought about that, but we're still using a pad of paper stuck to the fridge with a magnet, so it seems hard to implement. I generally do the shopping, and as I move to a new section of the store I run through the list placing dots left of items in that section. Then when I get each item I draw a vertical line through it. I find it easier to spot breaks in a vertical line than to spot missing check marks.
