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.