ive met people who can speak tolkiens elvish language...
as for the klingon... google has had a klingon language option for a long time...
http://www.google.com/intl/xx-klingon/
and hacker(leetspeak)
http://www.google.com/intl/xx-hacker/
piglatin
http://www.google.com/intl/xx-piglatin/
and theres a whole bunch others... click on language tools on the google page