3. A computer-implemented method comprising: identifying at a server a plurality of documents responsive to a search query, wherein the plurality of documents include at least one document visited by multiple distinct counted visitors during a time period; accessing, at the server, usage information associated with the plurality of documents, the usage information including, for each document, (i) a frequency of visit value based on a total number of times the respective document was visited by all counted visitors visiting the document during a time period, and (ii) a unique visit value based on a number of unique visitors among all counted visitors visiting the respective document during the time period; determining at the server, for each document, a usage score from the frequency of visit value and the unique visit value associated with the respective document; and organizing at the server the plurality of documents based, in part, on the usage scores for the documents.
15. The computer-implemented method of claim 3 , wherein, for each document: the frequency of visit value is equal to the number of times the document was visited during the time period; and the unique visit value is equal to the number of unique visitors to the document during the time period.