Controllermate (http://www.orderedbytes.com/controllermate/) - This is an outstanding program that allows you to customize almost any USB keyboard / mouse / controller / joystick to do exactly what you want, with a very clever and powerful graphical scripting environment. I have a Logitech Dual Action (with NO Logitech drivers instaled) wired up to switch spaces on the D-pad, volume on one joystick, screen brightness on the other. One button plays and pauses iTunes. I use it to add volume buttons to my Das Keyboard. No more crappy HID drivers. You can also create custom acceleration curves for mice.