Google have recently updated the generic list of top-level and regional domains it recognises.
Domains classed as Generic TLDs can be geo-targeted in Googles webmaster tools and hence enable the user to use directory structures for internationalisation of a website.
Two links:
Article showing the additions:
Googles recognised page for Geo-Targeted Domains in webmasters:
http://support.google.com/webmasters/bin/answer.py?hl=en&answer=1347922