Try this. Noli
~~~~~~~~~
def main(argv):
app = QApplication(argv)
QgsApplication.setPrefixPath("/usr/local/qgis1.6.0.app/Contents/MacOS/",
True)
QgsApplication.initQgis()
wnd = MyWnd()
wnd.move(100,100)
wnd.show()
retval = app.exec_()
QgsApplication.exitQgis()
sys.exit(retval)
if __name__ == "__main__":
main(sys.argv)