Two days ago I released version 0.8 of my Qt4 widget set called wwWidgets. The release is Qt 4.2-Qt4.4 compatible and consists of over 20 different widgets. The main focus was put on making the set compilable on all major platforms. The set also contains a Qt Designer plugin that makes it possible to use the widgets directly from Designer.
Visit http://www.wysota.eu.org/wwwidgets to find out more. Any feedback is greatly appreciated.