Maemo actually sounds like it'd be great. It's really cool to see a company like Nokia supporting open source software. Future versions of Maemo will likely be using Qt.
Think of the implications here. One could possibly run Qt/KDE applications on a mobile phone system, the same applications available in Linux, BSD, OpenSolaris, etc., as well as Windows and Mac. Having the same programs, the same documents, information wherever you go would be amazing.