A recommender system employs implicit ratings generated from monitoring user interaction with an item, such as while listening to a music track on a MP3 player or reading an electronic book. A method for generating item recommendations includes: providing an item to a device having an application for...http://www.google.de/patents/US6947922?utm_source=gb-gplus-sharePatent US6947922 - Recommender system and method for generating implicit ratings based on user interactions with handheld devices
