For anyone who is interested, i tried out stackz on my HD2 today and it seems to work fine, icon/button sizes are great (higher res screen, but compensated for by the fact that it is a larger screen). The only minor bug is that the images in the bottom menu are psychedelic colours. Only used it for a few minutes but will report if any other bugs surface.
+1 for a windows 7 version! ;)
+1 for a windows 7 version! ;)