In that same vain, I would love an emacs in a browser based on the Javascript language. So, a base API to create new buffers/windows. Ideally a theme manager and a plugin/extension system.

The goal would be to have this app open 24h/24 on a server and be able to totally use it from the browser and customize it with Javascript.

I would also be able to have a irc client (Think erc) directly in this 'editor' coded entirely in Javascript using this API. Basically, anything you could do with emacs would be possible, but directly from the browser hosted somewhere and running 24h/24.