To add one to your list: I just pushed out CoffeeScript 0.2.5 a couple of minutes ago. (CoffeeScript is a Ruby/Potion/Python/Harmony-ish to JavaScript compiler, for those who haven't seen it.)<p>I'm doing a talk about it tomorrow (Thursday) night at NYCJS, and if you live in New York and work on a source-to-source compiler, you should come and discuss implementation ideas.<p>Resources for doing this sort of thing are hard to find on the web. There's hardly space for comparison between "serious compilers", and things like like CoffeeScript and Pharen, which are both well under two thousand lines of code.