Here you can find an icon engine plugin for Qt which allows using SVG files as native icons. It works, but you should use Qt 4.1.3 to see the icons without bad crashes and render problems caused by the qsvgrenderer. Currently there is no cache built in. Feel free to implement one ;-)

http://www.qtforum.de/forum/viewtopic.php?t=2093

Regards,

E*