36. The system of claim 17 , wherein determining a navigation score for the revised query comprises: determining a traffic proportion for each resource identified by a search engine in response to the revised query, the traffic proportion being a proportion of traffic from search results generated in response to the query; and the navigation score threshold is a traffic proportion threshold.
36. The system of claim 17 , wherein determining a navigation score for the revised query comprises: determining a traffic proportion for each resource identified by a search engine in response to the revised query, the traffic proportion being a proportion of traffic from search results generated in response to the query; and the navigation score threshold is a traffic proportion threshold. 37. The system of claim 36 , wherein identifying the navigational resource for the revised query comprises identifying as the navigational resource a resource having a traffic proportion that exceeds the traffic proportion threshold.