Xephyr
Xephyr is a cool nested X11 Server. While I am doing Chandler development I can run Chandler functional tests in a Xephyr window where I don’t need to worry about the tests breaking because I happen to move the mouse or something. I can even minimize the Xephyr window while the tests are running.
Another cool thing I can do with Xephyr is to host a VNC session from it. OSAF remote people view and give demos using VNC, but I realized I could give a demo using this even while I am sitting in the same room as the others. As long as I have somebody else connect to the screen projector and running VNC client. That way I can work around the problems Linux has about projectors. I can even give a demo about Xephyr by launching another nested X11 session inside the first nested X11 session!
