I have packaged and built qjackctl for Mac OS X.  The QT look is for the mac and I have turned it into a portable .app.
I am hosting it at http://sahajo.de/files/qjackctl.zip as I figured the 99% linux people on this list would not want the 3.7 MB file in their inbox.  But, I do not wish to host it here forever and would be glad if it goes to the sf.net page.

-joachim