I am not talking about languages of Star Trek and Middle Earth, but Interlingua, Ido, Esperanto, etc.
(For the most part, the world seems to have adopted an inferior cousin of Basic English, known as "English." :) )
UPDATE: There seem to be more resources on-line for the Ido language than I realized at first, so my interest is now mainly in Interlingua and Ido. Esperanto's use of accent markings is enough to push me towards the other languages.