Last week I had an opportunity to see Mediacart in action and was pretty impressed by the scenarios that it could empower: quick scan and bag to speed the checkout process (for the retailer this can mean reduced labor costs); display store specials, discounts and coupons; get detailed product information and similar product comparison; access shopping lists from the stores website. For the retailer, the information gathered from cart locations, dwell times and items purchased can be valuable for data mining and prediction.