As an update,

Qt team already ported hildonized QML + Qt4.6 on N900, please follow the instruction here:
http://labs.trolltech.com/blogs/2009...e-for-maemo-5/

It runs pretty smooth on my device though you may encounter some glitches because it's still in development.

I have successfully mixing QML with OpenGL ES2 (not yet test on the device). However, that means your territory is more than expected.

Feel free to publish your innovation!