I finally got the new join dialog for Psi finished.

When the dialog opens it shows you the rooms available at your server, if there are any, your recently joined rooms and your bookmarked ones. At the top you simply enter the nickname which you want to use to join the rooms.

There's little special about this dialog and it works how you'd expect it to work, hopefully. If you want to give it a try yourself the code is available here.

Psi is a powerful and popular XMPP client which runs on nearly any platform. It recently got features like Jingle Audio which enables peer-to-peer audio calls.

These new features aside, Psi's user interface is lacking in various places, including, but not limited to, the multi-user chat area. This is kind of sad since the project's mission statement includes ease of use.
The second part of my Google Summer of Code project is to improve this area.

Psi's known to be used more by power IM users than by people who are new to IM, and as power user you like auto-join a couple of MUCs and also connect from multiple places to your account. However if you're already logged in and joined all those rooms, a lot MUC software will complain that you are already in the room, when a your second resource tries to auto-join those.