18. The computer system of claim 13 wherein the composite hash value is represented as a plurality of groups of digits and wherein the storage subsystem is configured to store the plurality of documents in a folder hierarchy comprising a plurality of folders arranged in a plurality of levels, each level corresponding to a different one of the groups of digits, wherein the folders within each level correspond to different values for the one of the groups of digits.
13. A computer system comprising: a storage subsystem configured to maintain a document information data store; and a processor coupled to the storage subsystem, the processor being configured to perform one or more content-based analysis operations on documents in a corpus of documents and to store results of the analysis in the document information data store, wherein the processor is further configured to: compute a composite hash value for each of the documents; assign each document to one of a plurality of groups, wherein all documents in a same group have a same composite hash value; perform the one or more content-based analysis operations on one document from each of the plurality of groups; and store a result of the one or more content-based analysis operations in the document information data store in association with each of the documents in the group.