Guide to international postal address formats

I have not found any definitive resource (there may not be one), but have found a several, which do not always agree. The first two seem helpful--though they seem to focus on addressing mail from the US to other countries. The third, a book on MSDN, varied significantly from the others and may be out of date.

1. Address Doctor Address Formats
2. Columbia U. FRANK'S COMPULSIVE GUIDE TO POSTAL ADDRESSES
3. Developing International Software Appendix V International Address Formats

Lots of information here for many countries (first hit on google for "international postal address format")

Have a look at this Wikipedia page: http://en.wikipedia.org/wiki/Address_(geography)