Hey! I am doing something very similar with PageKite (http://pagekite.net/), although the server does not run in a browser.

I've decided to try to get authors of similar tools together on a mailing list to discuss whether we can agree on a common protocol so our clients/servers (connectors/relays, backends/frontends) can be interoperable. Join us: http://mailman.klaki.net/mailman/listinfo/revprotun