A grocery service that monitors your pantry with an app that scans bar codes or let's you check off ingredients when you use them. Alerts you when things will expire or when you're going to run out. Could also be melded with a grocery service that prepares your basket for you with your staples before you come in. This breaks the "put the milk at the back of the store so you have to browse everything else first" model, but it could easily introduce a much more friendly "here's what you usually get and here's what we think you might like" concept. And of course you can have the pick up station at the back of the store too.
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