Ok, but see http://trolltech.com/products/qt/features/index
it says that "Qt applications run natively - indistinguishable from native applications - compiled from a single source code-base on all major platforms" and "Using Qt delivers true platform independence - code once and deploy anywhere. Targeting a new platform demands little more than a simple recompile of a single source code-base"
I just think i've not understood mandrav and yop correctly...
By the way, you can see their screenshots also
Well QT and wxWidgets almost do the same job. Many people prefer wxWidgets because is free for comercial applications, and for independent and small teams of programmers willing to make some money for their knowledge is great.
Commercial support of QT is good as I have heard, but really expensive, and you have to paid for updates, and to use special parts of the code for commercial applications, while theres plenty documentation of wxWidgets.
I have never tried QT because I'm a programmer trying to make some money, not to spend it on costly tools. Also imagine, how programmers will make money if they don't make custom applications for companies. There are small companies that doesn't want to pay so much for an application. Here wxWidgets is a life saver.
For example:
QT license prices are thousands of dollars and you sell your program for $800 dollars, what are you gaining or how you can compete in price with others?
Also I have seen that QT on windows is not so fast than wxWidgets, I have work with scribus (a desktop publishing application made on qt) to make newspapers and is some kind of slow drawing graphics, but in the other part theres no desktop publishing software made on wxWidgets I think, so I'm not so sure about this.
Here is information of the different toolkits with small comparisons with wxWidgets:
http://www.wxwidgets.org/wiki/index.php/WxWidgets_Compared_To_Other_ToolkitsHope you got another point of view!.
Edit: it says that "Qt applications run natively
Answering that question, that means that the code is compiled into machine code, not like Java or .Net, that compiles to a intermediate language or byte code. Also that while running the application has the look and feel of windows and mac.