This application accesses the MableGeocorr database (rev. Sept 2011) with 2010 (and later) geographic codes, and generates "correlation list" reports / files.
Links: Cure for Common Codes (related app)   |   Previous Version (with 2000 vintage geos) | Tutorial (ppt)
There is now a tutorial comprised of
videos of geocorr2k sample runs.
Note: The Help page has not been updated for the new 2k version. But an awful lot of what was true then still applies.