Sep 20th, 2013
Mediacurrent article on basic multilingual setup in Drupal 7: http://www.mediacurrent.com/blog/building-multilingual-websites-drupal-7-0
i18n Drupal module handbook: https://drupal.org/node/133977
Net Whisperer article: http://www.netwhisperer.com/2012/01/05/content-translation-on-drupal-7/