On the last page of the installer, there is a check box to launch Qt Creator.
When checked an attempt is made to open Qt Creator but it fails silently. On the console the error is:
Qt/Qt Creator have been installed with the default setup offers by the installer.
Package is qt-linux-opensource-5.0.0-beta2-x86_64-ubuntu1110-offline.run (downloaded 30/10)
OS: Ubuntu 11.10 64b