I wonder if this is going to become even more of a problem as OS's become more gesture-based like iOS and Lion. All of the three- and four-finger swiping actions in Lion are amazing and useful, but only if you know about them and can remember them. Apple stores do a pretty good job of educating people when you go in to buy a new Mac, but "pinch with 5 fingers to open launchpad" might be harder to learn than "cmd + f"