Well, first of all, Qt is anything but new. It's an existing, cross platform... platform... developed by Qt Software / Trolltech.There's no challenges in cross platform that Qt hasn't already lived with since the dawn of the IT era (1994, to be more precise). They were bought up by Nokia 2008/2009 and since then Qt has been adapted by Nokia. Till just now. We do know where they're going now, though - Nokia is dividing it up; "Nokia said it would sell the commercial licensing business of Qt to Digia PLC on March 2011".

The Qt strategy was a good one. However, they pulled the plug before they even started to sell the idea to Symbian or multiplatform developers, so it never got tested in real life. I doubt that the Qt strategy would/could have done anything good about the inherited flaws in Symbian, but it would do very much for the applications on top of Symbian (and thus, MeeGo).

Second, there's a whole lot to be said about Sun/Java's implementation of "cross platform". That does not mean that everybody else would take the same route of cross platform not being cross platform at all.

The "Write once and run anywhere" strategy has made Windows the most used operating systems throughout time. Some applications from MS DOS will still work with Windows 7, applications will work across virtualbox on cell phones, servers, tablets, tabletPCs, netbooks, pretty much any computer made after the given software were created. Oh, and while Sun may have stumbled, Android is nothing but a virtualization motor made in a rip-off copy of Java. So, I think the whole Write once and run anywhere strategy can work very well, thank you vely mush.