This is awesome. Kinda related, I've been thinking for ages about whether one could now do encrypted chat between users in the browser, with the encryption happening at either end and the server never seeing plain-text.<p>Back in the real World, is there a mechanism to do a quick 'email to invite user to chat to me'? That would seem like a pretty solid way to win eyeballs.<p>My dad isn't on Yahoo, but he could click a link and run javascript.