(Thanks to NoCamels.com) Israeli start-up Smartli has developed an automatic grocery shopping system that uses sensors to track the items missing from your fridge. It then generates a shopping list, and ensures that these items are delivered directly to your door at your preferred time.
http://nocamels.com/2013/10/smartlis-automatic-grocery-shopping-system-will-make-sure-your-fridge-is-never-empty/