1. An automated method, comprising: identifying documents in a current clustering operation; assigning the identified documents to one or more clusters; selecting a current representative document for each of the one or more clusters; determining whether the current representative document has been re-crawled; determining a previous representative document with which the current representative document was previously associated in a prior clustering operation, if it is determined that the current representative document has not been re-crawled; determining one of the one or more clusters to which the previous representative document has been assigned in the current clustering operation; combining one of the one or more clusters associated with the current representative document that has not been re-crawled with the one of the one or more clusters associated with the previous representative document into a combined cluster; and storing information regarding the combined cluster.