Coffee script is now supported by
jsapp.us
To use it, you just have to have the suffix .coffee on you file, and jsapp will recognize it as a coffee script and use coffee 1.0.0 to compile it. This also works with the new command line tool, so if you have a .coffee file on your hard drive you can run jsapp test [filename] to see that file running live.
If you know of other languages that compile to javascript let me know for consideration in inclusion.
Little rant:
So I kept trying to find a simple way to run coffee script by having an external javascript file that would load in and compile the coffee script, but due to the fact that the code is loaded right before it needs to server a request, it made it hard to do anything with the filesystem without having to set something up to hold the request while waiting for the filesystem.