Abstract: Various processes are disclosed for discovering item relationships between particular items, such as products represented in an electronic catalog, based on monitored user behaviors (e.g., item viewing activities, item purchases, shopping cart activities, etc.). The discovered item relationships may, for example, be used to generate personalized item recommendations for users, and/or to supplement item detail pages of an electronic catalog with lists of related items. Also disclosed are processes for generating personalized item recommendations based on users' search activities and browse node visits.

Abstract: A computer-implemented service integrates with merchant sites to enable registered users of the service to perform purchase transactions on the merchant sites. In one embodiment, a merchant can incorporate a reference to a display object served by the service into coding of a page of the merchant's site. When the page is loaded by a user's browser, the reference causes the browser to request the display object from the service for display on the page. If the user is recognized by the service, the service may return a personalized display object that includes functionality for the user to perform a purchase transaction using the service. Also disclosed are embodiments that enable users to initiate transfers of personal account information to the merchant sites.