Now, I don't think we necessarily want to integrate regarding city names yet) but the overall question is whether it would be helpful to use the data from geonames (possibly with updates as the world changes) for countries and states/provinces? This should allow us better validation and the like, and we could do something autocomplete-wise for provinces.
http://www.geonames.org/export/
My thinking is we could break this off into a separate PostgreSQL extension, replacing our current countries list, bundle it with our software, package it, and the like. I believe we could also include postal codes from around the world.
Is this of interest? If so I will add a feature request.
Best Wishes,
Chris Travers