1. A search engine implemented within a computer device, comprising: a component to receive a user search query; a document locator to identify documents responsive to the user search query; and a decision component to: rank the identified documents, calculate a click-through rate associated with each of the identified documents, and associate, with a link to a particular one of the identified documents, a thumbnail representation of the particular document in response to calculating that the click through rate associated with the particular document is higher, by at least a threshold amount, than the click through rates associated with all other ones of the identified documents.
1. A search engine implemented within a computer device, comprising: a component to receive a user search query; a document locator to identify documents responsive to the user search query; and a decision component to: rank the identified documents, calculate a click-through rate associated with each of the identified documents, and associate, with a link to a particular one of the identified documents, a thumbnail representation of the particular document in response to calculating that the click through rate associated with the particular document is higher, by at least a threshold amount, than the click through rates associated with all other ones of the identified documents. 4. The search engine of claim 1 , where the click-through rate associated with the particular document is calculated based on a total number of times users have selected the particular document responsive to the search query and a total number of times users have selected another one of the identified documents responsive to the search query.