An NES emulator, Javascript, HTML5 and Google Search walk into a bar... (zelex.net)

Run it in Chrome. All other browsers perform pretty horribly.

It didn't work for me until I noticed that there was a plugin being blocked. (I block all plugins by default.) You forgot to mention Flash in the headline. :P

Awesome idea though!

Yes, chrome requires a flash plugin for sound. Firefox supports it natively.