A system provides consumers more product information to make informed buying decisions as well as recommendations, promotional messages, or couponing associated with a selected or related product. When used in a retail environment, radio or visual tagging of the products, displays, or retail shelf allows a mobile or other computing device to read a unique identifier and use it to retrieve the product information from a remote server. In some embodiments, structured identifiers indicate particular sources, product lines, production batches, marketing channels, retail destinations, and the like. In others, the information is retrieved as a function of one or a combination of products that the consumer has considered during a single in-store shopping trip.