There is a new meta tag that came out on February 19th named NAC (Natural Area Code), according to Chris Sherman. The Natural Area Coding System is "a new system to standardize and integrate geodetic datums, geographic coordinates, geographic area codes, map grids, addresses and postal codes in the world."
The tag looks something like <meta name="NAC" content="6TFMX N1HC8">
BakedJake at a thread at WebmasterWorld said "The engines can solve the problem already (whether or not they are applying the solution is a different story)." He adds, "and I don't see a good use for the application other than to sort into country indexes on a global scale."
Something new for your folks.