It's fun by itself, but what I believe could make it really useful would be to include interactive tutorials for each language. That's what I was expecting when I clicked the link.
We have put lots of time and effort into getting all of these languages to run smoothly in the browser, we thought we would showcase this project before continuing on with our plans (more languages, tutorials, etc..).
Sorry I realize my comment sounded a bit negative, which wasn't at all my intention. You've done a fantastic job already and it's great to know tutorials are on your todo list.
