18. A computer-readable storage medium whose contents cause at least one computing system to perform a method for scoring the relevance of documents to terms, the method comprising: under control of the at least one computer system configured with executable instructions, initializing a first set of rating scores for combinations of a plurality of documents with a plurality of query terms included in a plurality of queries, each rating score of the first set of rating scores reflecting a first determined level of relevance of one of the plurality of documents to one of the plurality of˜terms, the plurality of documents being returned in response to the plurality of queries; initializing a second set of rating scores for combinations of the plurality of documents with a plurality of terms not included in the query terms, the plurality of terms being associated with the plurality of documents, each rating score of the second set of rating scores reflecting a second determined level of relevance of one of the plurality of documents to one of the plurality of terms; observing interaction of a plurality of users with respect to a selected document of the plurality of documents during a rating period to detect any of a type of content interaction, each of the type of content interaction being performed by a user with respect to the selected document when included in a result set generated in response to a query comprising one or more query terms from the plurality of query terms, the type of content interaction comprising highlighting content of the document and annotating content of the selected document; and in response to detecting each of the type of content interaction performed by any of the plurality of users, adjusting a rating score of the first set of rating scores for at least one combination of the selected document with respect to which the action was performed and a term among the one or more query terms, the rating score being adjusted by an amount based at least in part upon the detected content interaction, the adjustment to the rating score being configured to be positive based at least in part on the detected content interaction, each adjustment to the rating score corresponding to an inferred relevance of the selected document to the query term; and adjusting a rating score for at least one combination of the selected document with respect to which the action was performed and one of the plurality of terms not included in the query terms and associated with the selected document, the rating score being adjusted by an amount based at least in part upon the detected content interaction, the adjustment to the rating score being configured to be positive based at least in part on the detected content interaction, each adjustment to the rating score corresponding to an inferred relevance of the selected document to the one of the plurality of terms; for each of a plurality of documents included in a distinguished result set produced in response to a distinguished query comprising a set of distinguished query terms, at least: selecting ratings for each combination of the document and a query term among the distinguished set of query terms, and determining a ranking score for the document in the distinguished result set by combining the selected ratings.
18. A computer-readable storage medium whose contents cause at least one computing system to perform a method for scoring the relevance of documents to terms, the method comprising: under control of the at least one computer system configured with executable instructions, initializing a first set of rating scores for combinations of a plurality of documents with a plurality of query terms included in a plurality of queries, each rating score of the first set of rating scores reflecting a first determined level of relevance of one of the plurality of documents to one of the plurality of˜terms, the plurality of documents being returned in response to the plurality of queries; initializing a second set of rating scores for combinations of the plurality of documents with a plurality of terms not included in the query terms, the plurality of terms being associated with the plurality of documents, each rating score of the second set of rating scores reflecting a second determined level of relevance of one of the plurality of documents to one of the plurality of terms; observing interaction of a plurality of users with respect to a selected document of the plurality of documents during a rating period to detect any of a type of content interaction, each of the type of content interaction being performed by a user with respect to the selected document when included in a result set generated in response to a query comprising one or more query terms from the plurality of query terms, the type of content interaction comprising highlighting content of the document and annotating content of the selected document; and in response to detecting each of the type of content interaction performed by any of the plurality of users, adjusting a rating score of the first set of rating scores for at least one combination of the selected document with respect to which the action was performed and a term among the one or more query terms, the rating score being adjusted by an amount based at least in part upon the detected content interaction, the adjustment to the rating score being configured to be positive based at least in part on the detected content interaction, each adjustment to the rating score corresponding to an inferred relevance of the selected document to the query term; and adjusting a rating score for at least one combination of the selected document with respect to which the action was performed and one of the plurality of terms not included in the query terms and associated with the selected document, the rating score being adjusted by an amount based at least in part upon the detected content interaction, the adjustment to the rating score being configured to be positive based at least in part on the detected content interaction, each adjustment to the rating score corresponding to an inferred relevance of the selected document to the one of the plurality of terms; for each of a plurality of documents included in a distinguished result set produced in response to a distinguished query comprising a set of distinguished query terms, at least: selecting ratings for each combination of the document and a query term among the distinguished set of query terms, and determining a ranking score for the document in the distinguished result set by combining the selected ratings. 23. The computer-readable storage medium of claim 18 wherein the type of content interaction further comprises searching within the document.