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Touch is wonderful for small devices with limited room for input methods (i.e. smartphones and even tablets). I don't see touch having any point at all in specialized devices (i.e. MP3 players, cameras) or in full-blown computers. Tactile switches will ALWAYS be ergonomically superior to touch controls--always.
Apple's new iPod Nano is stupid. Why does it need touch controls? It doesn't. It is an MP3 player. It doesn't do anything but play MP3s and videos. Actual buttons would be vastly superior on the device. Touch-enabled desktops are stupid, too. Using a touchscreen on a vertically-oriented monitor is a major ergonomic fail--it's just not comfortable.
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