18. The computer-readable storage medium of claim 17 , wherein the document score is generated according to the formula score=rank·log(count), where rank corresponds to the identified document's ordinal position in the results set in which the identified document is found, and count corresponds to the total number of documents contained in the results set in which the identified document is found.
17. The computer-readable storage medium of claim 16 , wherein the document score is generated based on the identified document's ordinal position in the results set in which the identified document is found, and the total number of documents contained in the results set in which the identified document is found.