Quite often I go to the supermarket and forget to take the shopping list, that is what happens when you write your shopping list on a piece of paper. Instead we could write our shopping list using Reminders from iOS five. Our list of reminders will appear in our alerts on our iPhone or iPad when we arrive at the shop, if we use the location-based reminder tools.
On account that we will have our eye device there with us we will also be able to use the integrated Twitter in iOS five and give a tweet to let people know that we have remembered to buy everything on the list.