Spec: http://wiki.ecmascript.org/doku.php?id=harmony:direct_proxies
Multiple inheritance using Proxies: http://blog.avd.io/posts/multiple-inheritance
JavaScript DOM implementation using Proxies (old API): https://github.com/andreasgal/dom.js
HTML generation using Proxies (old API): https://gist.github.com/nzakas/1202328
Higher-order messaging in Ruby (inspiration for the JS example): http://kbullock.ringworld.org/2007/03/26/higher-order-messaging/