Without attempting to be too technical and without pretending that I am an expert at this stuff: You already could create HDR images from several versions of the same photo (with different exposures) in Cinepaint. But to convert HDR image to JPG or anything else that can be displayed on monitor (and looks trippy), you need to perform "tonemapping" which, until now - had to be painstakingly done using command line tools and Gimp.
QTPFSGUI makes tweaking all the parameters much more fun. Just have a look at my first experiment. Oh dear, it seems I have a lot to learn...
