1. A method comprising the following computer-executable acts: a) analyzing a relationship between a first query and a second query based at least in part upon search results previously selected by users, wherein the search results previously selected by the users were presented to the users in response to submission of the first query and/or the second query to a search engine; b) determining whether the first query is substantially similar to the second query based at least in part upon the analysis; and c) generating correlation data that correlates the first query and the second query if the first query and second query are determined to be substantially similar.