I've just started working on full-featured Lisp in javascript over the past few weeks: https://github.com/jlongster/outlet
It will compile to js and lua, and I'm focusing on writing games with it. I can attest that writing a Lisp compiler is really fun and shockingly simple in some places.
Current features I'm working on: http://jlongster.com/2012/01/16/outlet-gets-a-personality.ht...