13. The computer-readable medium of claim 12 wherein selecting the representative query for each query cluster further comprises: selecting the representative query based on a query popularity score for each search query in the cluster, where the query popularity score for a search query is based on a rate of increase in search volume for the search query or a total search volume for the search query.
14. The computer-readable medium of claim 13 wherein selecting the representative query for each query cluster further comprises: selecting the representative query based on a query performance score, where the query performance score for a search query is based on one or more of a page rank, a click-through rate, a click-through duration, or a click-through reversion rate for a respective result document of the search query, the respective result document being responsive to the search query.