Abstract: Expert domains for a query category represent domains from which a high percentage of search results for queries associated with the query category are retrieved. The expert domains are identified by establishing a base statistical model that indicates frequencies of appearance for domains in search results retrieved for queries corresponding to multiple categories. In addition, frequencies of domain appearance are determined for search results retrieved for queries associated with a category. Domains that appear more frequently in the search results corresponding to the category are identified as expert domains for the category. A user may be allowed to customize expert domains related to one or more categories by adding or removing expert domains for the category.

Abstract: A list of “hot topics” may be provided to a user to indicate information that is currently popular. A topic may be deemed popular when a large number of search queries related to the topic are entered by users. A search system may receive and analyze an electronic source of published information to determine a reason for why a particular popular topic is popular. If content related to why a particular popular topic is popular exists in multiple electronic sources of published information, text summarization techniques may be used to determine a reason for why the popular topic is popular by from among the multiple electronic sources of published information.

Abstract: Search results are assigned scores based on visual aspects of surrogate representations of the search results which are to be displayed to a query submitter in a search results summary overview. That is, the surrogate representations are relatively short summaries or excerpts of the search results that may be presented in place of the search results themselves, thus enabling an overview of various search results to be perceived by a user concurrently. The search results are assigned scores based on the presence, position, and form of some or all of the query within the corresponding surrogate representations. The search results may be sorted or filtered based on the assigned scores. Assigning scores to the search results based on visual characteristics of the surrogate representations mimics how a user may assess the relevance of the search results when viewing a search results summary page.

Abstract: A search query is submitted to one or more information sources associated with a category of the query. The category of the query is indicated by a query ontology that relates queries to query categories. The information sources represent information sources from which a high percentage of search results for queries associated with the category are retrieved. For instance, the category of the query is identified by identifying categories corresponding to variations of the query, where each variation represents a combination of the terms within the query, and where the categories of the variations are assumed to be the categories of the query. Information sources associated with the query categories are identified, and the query is submitted to the identified information sources. Submitting the query to the identified information sources may cause search results retrieved for the query to more closely reflect search results desired by a user that specified the query.

Abstract: Expert domains for a query category represent domains from which a high percentage of search results for queries associated with the query category are retrieved. The expert domains are identified by establishing a base statistical model that indicates frequencies of appearance for domains in search results retrieved for queries corresponding to multiple categories. In addition, frequencies of domain appearance are determined for search results retrieved for queries associated with a category. Domains that appear more frequently in the search results corresponding to the category are identified as expert domains for the category. A user may be allowed to customize expert domains related to one or more categories by adding or removing expert domains for the category.

Abstract: Search results may be sorted or filtered based on scores assigned to the search results. For example, scores may be assigned to the search results based on characteristics of surrogate representations of the search results, which are relatively short summaries or excerpts of the search result that may be presented in place of the search results themselves, and those assigned scores may be used to sort or filter the search results. In one example of filtering, pairs of search results may be examined to identify significant drops in quality between the search results, which is indicated by a large relative or absolute difference in the scores of the search results. Search results with scores that indicate ranks that are lower than a lower ranked search result of the pair of search results may be eliminated when the difference between the scores assigned to the pair of search results exceeds a maximum allowable difference.