I knew Indonesian because i lived in Indonesia for 16 years .. But i forgot Indonesian the same day i returned to Serbia ... So Indonesian and thats it :P
I wanted to learn Spanish a while ago, didn't get to it up to now.. One language I really would want to learn is Gaelic. But that will be lil' harder ^^
Mandarin. Or Fookien, and i hope I spelled it correctly. China is emerging as the next or is already an economic leader in the world. Soon, this generation will be dealing with Chinese businessmen and it would help a lot if one can speak their language.
I would like to learn Italian better than now because it's words are similar to Spanish and French so it would then become easier to learn even more languages.