How do you mirror a video projector with Mountain Lion?

I also missed the feature so badly that I wrote a replacement for the original monitors menu and put it on the Mac App Store:

http://itunes.apple.com/de/app/display-menu/id549083868?mt=12

Hope that helps some people out!

May be this will help. Monitor the More Like this box for additional threads. It seems a lot of others are having problems:

https://discussions.apple.com/thread/4202678