http://www.pckeyboard.com/page/product/UNI0476 http://www.pckeyboard.com/page/product/UNI0476 Not a vertical mouse, but surprisingly good. Only miss mice when

http://www.pckeyboard.com/page/product/UNI0476 http://www.pckeyboard.com/page/product/UNI0476 Not a vertical mouse, but surprisingly good. Only miss mice when playing around with graphics software. I have it in PS/2 and USB, and they did a hack job with the USB hardware, it's very low resolution. PS/2 connector gives a very smooth and nice trackball experience if anyone is tempted.