first of all great work!
Here is a suggestion how to improve the usability for everyday users:
Wouldn't it be great if people could continue using their traditional services such as facebook chat etc. and jitsi just took care of the encryption in the background?
At the moment one has to use the jitsi interface to securely chat with friends. Now I am thinking about a jitsi firefox addon that allows people to type their messages directly into their familiar facebook chat window, without any extra windows open. Now, when you press the send button, the message is automatically encrypted by jitsy and delivered.
The idea is to make encryption as simple and user friendly as possible, i.e. to make it almost invisible. With this new approach there would be no extra windows, no additional user interface. All that people had to do is install jitsi and the firefox addon to enjoy encrypted communication. People love it simple.