I manually translate prototype algorithms from greasemonkey scripts i test in the browser, into whatever language i like.
There is no real[1],native code compiler for JS yet. Its too browser/web-centric.
<chrisdone> I use horrible not-even-MVC (shock! horror! get out!) style code and use JScript server side rather than c# or visual basic... one day I may learn how to program ENTERPRISE but it's so hard to enjoy it