You're probably thinking of an emacs mode that does this on its own, but it would also be excellent to have an emacs minor mode that integrates with Etherpad. Ideally, you just do M-x etherpad-buffer and emacs tells you a URL that you can then send around and let other people watch / co-edit whatever you're editing in emacs.
To make this work, Etherpad would need to provide an API, though not necessarily a well-documented one. A supported API might make sense for Etherpad, though. Imagine being able to load a Wordpress plugin that enables playback of your blog posts. Or something that lets you co-author blog posts on etherpad. Oh, and greasemonkey scripts that let you co-edit any elements in a web form. OK... let's not get ahead of ourselves...
Not so sure; if I'm not mistaken Lynx javascript support is rudimentary (if not non-existent). Doing Comet on that would be somewhat challenging, I guess.
