These widgets are very nice. Something like QwwFileChooser should totally be included in Qt, I use my own for almost every app.
A widget I'd like to see is one from KDE, similar to QwwClearLineEdit, see pictures from Amarok in attachment.
Basically it's a LineEdit with a clear button, (optional) label and an (optional) extra button on the right, the LineEdit displays useful help-text in color similar to background. When you click into the LineEdit the help-text disappears and you can write in it like usual -- you can't interact with the help-text, it just gets out of the way as soon as the LineEdit gets focus. If you leave the LineEdit empty the help-text reappears when the widget loses focus. Very slick.
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