Qt (pronounced Cute) is perhaps best known as the application development framework behind the open source KDE Linux desktop. It's now ready to build applications for the competing GNOME Linux desktop and is ready for Windows Vista as well.
Qt 4.2 is the latest version of the C++ application development framework from Norway-based Trolltech. Cross platform development has long been the promise of Qt, though achieving cross-linux desktop compatibility has not been an easy chore.
http://www.internetnews.com/dev-news/article.php/3636101