Short term: Esperanto.
Long term: Lajban.
|+||English is currently the international language.|
|+||Restricting your vocabulary to the (~1,000) most common words will increase your potential audience.|
|-||English sucks - much inconsistency and vagueness.|
|+||Most commonly used synthetic language.|
|+||Designed to be easy to learn.|
|+||Designed on the theory that your spoken langauge limits the way you think (to reduce those limits).|
|+||Greater means of expression.|
|+||No irregularities or ambiguities in spelling or grammar.|
|+||All roots are computer generated from an analysis of the similarities between the equivalent roots in the six most common languages, and five letters long.|
|+||Reminds me of LISP: "LISP is worth learning for a different reason — the profound enlightenment experience you will have when you finally get it. That experience will make you a better programmer for the rest of your days, even if you never actually use LISP itself a lot." - ESR|
|-||Simplicity was not a design goal.|
|-||Mostly spoken by people who already speak English and Esperanto. Website is only in English. Learning aids need to be translated to more languages.|
"No language is worth learning that does not affect the way you think."
I can see learning more languages primarily so I can translate the Lojban learning aids to those languages.
I still need to implement relax ng style <choice> for my HTML5 schema.