I have setup a svn repository for version control of my so called QTfeedback code. That repo is public of course. License is GPL v2.1. Further Infos and Screenshots will be released on time. At the moment the interface is in german, but you will easily get through for sure :)
svn co https://qtfeedback.svn.sourceforge.net/svnroot/qtfeedback qtfeedback
If you want to compile, make sure you have OpenGL 2.1 driver and libnoise (http://libnoise.sourceforge.net/) installed.
Updated to version SVN 6, color gradients from user images.
By the way. After uploading the feedback video, i found more works on feedback code. One I want to mention is dave bollinger. His idea was the same but he used more rectangles. I follow him, so QTfeedback offers now multiple feedback planes. How nice...