First of all, project looks great! Haven't had a chance to try it yet, but I've been impressed with other WebRTC demos, including http://vmux.co which is similar but uses Twitter to authenticate.

My slightly less positive feedback would be, it seems dodgy that it uses personatest.org instead of persona.org (and there's no website at www.personatest.org verifying its legitimacy). Kind of makes me anxious that I'm being phished. Any reason for this? You surely don't want people getting used to entering their Persona credentials at sites other than persona.org.