I have to admit that I know a form of these are on the way. Intelligent Shopping Carts which help you identify what you want to buy, notify you of specials etc.
However these are engineered for companies benefit moreso than the consumers.
What I would like is to walk into a store (thinking Supermarket here) – it knows my favourite brands, it knows that I always buy bananas or that if I wander down the meat section I never buy Pork but buy Steak, potentially even it can monitor my shopping habits and recommend new products based on others. Kind of like Last.fm but for food.
So how could you implement this? Intelligent glasses that glow on the products you like. Too geeky methinks.
Shopping Cart is a winner – simply login, swipe each product as you add it. Hey you could even tally my purchases as I go. Now that would be neat.
Again like Last.fm needs to be built around the customer – not the supermarket (whom just want to push more products into your trolley). If you help me enhance the experience I will shop more often. Simple as that.