simple qt example for Maya2010 - untested

from PyQt4 import QtCore, QtGui
import maya.cmds as cmds
import pumpThread

class TestUi(QtGui.QDialog):
    def __init__(self, parent=None):
        super(TestUi, self).__init__(parent)
        layout = QtGui.QHBoxLayout()
        self.setLayout(layout)
        self.button = QtGui.QPushButton()
        self.button.setText("Qt Test Close")
        layout.addWidget(self.button)
        self.setWindowTitle("Test PyQt Ui")
        self.connect(self.button, QtCore.SIGNAL("clicked()"), self.close)

    @staticmethod
    def Display():
        global form
        app = QtGui.QApplication.instance()
        pumpThread.initializePumpThread()
        form = TestUi()
        form.show()

if __name__ == "__main__":
    TestUi.Display()