I just found a great resource for how to turn Pd into a real MacOS X app. Basically, you modify a copy of Wish Shell.app into the launcher for Pd. A file named AppMain.tcl will automatically launch upon being double-clicked.
http://gd.tuwien.ac.at/languages/tk/tcl/README-MacOSX
http://www.ling.lu.se/persons/Johan/tcl/ http://www.speech.kth.se/wavesurfer/
Download the Wavesurfer app and try it and you'll what I mean. I'll give it a shot tomorrow morning.
.hc
________________________________________________________________________ ____
Man has survived hitherto because he was too ignorant to know how to realize his wishes. Now that he can realize them, he must either change them, or perish. -William Carlos Williams