1. Remove directory "Nokia" from %APPDATA% which contains Creator's settings.
2. Install Qt for Maemo from Qt SDK 1.1 rc.
3. Install Qt Creator 2.2.
4. Run Qt Creator 2.2.
   Qt for Maemo is not being found automatically.
5. Set up Qt for Maemo in Tools / Options.
   A Maemo GCC tool chain is being detected. gdb is being found in Creator 2.2's installation directory.
6. Open a project and set up a Maemo target for it.
7. Run this project in debugger.
   Creator will display "Starting debugger 'GdbEngine' for ABI 'arm-linux-maemo-elf-32bit'..." and that's it.
8. Try to close Creator.
   The GUI disappears but the process keeps running.

When I run the Creator from the SDK before step 4, this will set up the Qt versions. Running Creator 2.2 then works fine, including debugging on Maemo.