from PyQt4 import QtWebKit, QtCore, QtGui
...
self.webView = QtWebKit.QWebView(Dialog)
self.webView.setUrl(QtCore.QUrl("http://python.su/forum/viewtopic.php?id=2959"))

>>> from PyQt4 import QtWebKit, QtCore, QtGui
>>> app = QtGui.QApplication([])
>>> view = QtWebKit.QWebView()
>>> view.load(QtCore.QUrl('http://python.su/'))
>>> view.show()
>>> app.exec_()