I'm not a developer, but I think this would be a great app (and may exist). I use a app to create a shopping list, but often forget that I have added items to it when I walk into any given store. I know there are apps like Locale that change your ringer settings etc. based on locations. Would be nice to have an app that would "RING YOU" when you walk into a store, lets say "Walmart".. and based on that location your phone would ring and bring up the shopping list app. Just a thought..