"What was most perplexing of all to me was that, although I was certain that the ads contained Chinese phrases and sentences, every Chinese person to whom I showed them emphatically maintained that they could not understand a single word."
An index to 1,696 constructed languages. (or just look at the top 200) From the Nadsat of a Clockwork Orange and Tolkein's Quenya to Star Trek's Darmonk, a language based solely on parables (though Gene Wolfe got there first) and Borges's language of Tlon, there is plenty here for science fiction fans and language geeks alike. And, yes, for all you fanatics, Esperanto is listed, as is your source for news in Special English, limited to a 1500 word vocabulary.
According to Stanley Fish, "Students can't write clean English sentences because they are not being taught what sentences are." The solution: make them invent their own language. After a generation that privileged content to the exclusion of form, is the pendulum swinging back the other way?