New MBP. F11 has vol down symbol. Looks like I'd need to disable all the special symbol functions in the keyboard prefs in order to assign one to Expose's show desktop function. Not worth loosing all the other special functions. Be better if I could just re-assign the F4 dashboard key to show desktop instead since I don't use dashboard.
Actually, I don't like the way expose does the show desktop by sliding everything up and making that border around the screen as a temp situation. I'd rather it just be exactly like the normal desktop with all other windows and apps hidden. It seems there used to be a command for that in the old Mac OS.