Languages multilingual bilingual

We have multiple domains, all allowing multiple languages, each with a different default language, and all sharing some content.

We're currently trying to deal with the following problem scenario:

We have a U.S. site with English as the default language.

We have a France site with French as the default language.

We have a Spain site with Spanish as the default language.

We create a language neutral node on the U.S. site, and we allow that node to be displayed on the French site and the Spanish site. No problem.

We are trying to build multilingual sites for United Nations entities using Drupal7. We are still looking for the best modules/practices to accomplish a multilingual website. In wordpress, there is WPML and in Drupal there is the i18n which is still not available in 7. Anyway, please feel free to post and add comments to this discussion, it would be very helpful.

Cheers