1. A computer-based method for associating an item with submitted web page content and providing information about the item, the method comprising: under the control of one or more computer systems configured with executable instructions, storing, at an information server of an electronic marketplace, a plurality of queries previously submitted by users in relation to a plurality of items including the item, wherein individual previously-submitted queries are stored with a popularity of submission for the individual previously-submitted queries; responsive to a link-selection request by a user for a web page of a media web site provided by a media content server, receiving, at the information server of the electronic marketplace, an automatically generated request from the media content server to provide item information based at least in part on the web page content to be displayed on the media web site, the media content server being different than the information server of the electronic marketplace, the web page content submitted in the generated request having been derived by the media content server; matching, at the information server, the item to the submitted web page content by at least: identifying a previously-submitted query from the plurality of previously-submitted queries as a matching query based at least in part on a relevance of the matching query to the submitted web page content and the popularity of submission of the matching query; executing the identified previously-submitted query independent of user input; identifying a set of one or more items that correspond to the executed query; and selecting the item from the identified set of one or more items as a matching item; and providing, asynchronously relative to when the web page content is made available by the media content server, the item information about the matching item to the media content server to be sent to a user device as supplemental content for display on the media web site along with the web page content.