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The complete address formatting standard is maintained by
the International Postal Union (UPU) in their standard UPU
42-1 which in itself is an extension to the EU standard EN
14142-1.

Assuming that PGV will be a world-wide smashing hit the
management of addres fomatting will be a huge taks if it
shall be done "properly" according to these standards.

I believe however, that international address formatting is
not a task for PGV. It would be a far more flexibe solution
to just store those addresses that are in use as plain text
fields. Leaving the formatting of the address to the author.