These days if I don't have my shopping list I can't make it through the store efficiently. Whether the list is long or short, if an item doesn't make it on the list, I will forget about it. I try to make my trips for errands as efficient as possible, making lists for each store I will visit and in which order I will go (so that I don't do a lot of backtracking while driving). This has worked out great for me. When the list is complete. However, there are those times when the shopping list is not complete, and I walk aimlessly through the store trying to remember if it was toothpaste or nutella that I wanted to get.
I really like the idea of a website that could simplify the list making for me and break down the items into the store columns so that I could just print out my list (on scrap paper of course) and be on my way.
This would really be helpful for the grocery shopping list staples. That is your regular shopping list, milk, eggs, butter, nutella, etc. That way it is always ready for you online. I assume that if you forgot your list at home, a dreadful occasion, you could log in via your iphone, and get your list online. Your trip to the store would not be wasted. Good old technology saves the day.
Keep up with the latest about these shopping lists on facebook, the networking that helps you stay organized.