I initiate translation of Drupal interface to Esperanto. But I only study Esperanto and my knowledge of it is very basic now. I hope someone from Drupal users may be interested with this international language and help with translation. Project page is http://drupal.org/node/12520

If you interested to get more details about Esperanto look at http://www.uea.org or http://www.esperanto.net
You may study this language at free internet courses (available on many national languages) http://lernu.net

Amo, Libero, Esperanto! :)