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If you're not particularly happy with the keyboard on your 15-inch G4 Powerbook, TouchStream makes a new ergonomic keyboard that you can swap in there. The MacNTouch (one of those too clever by half names) isn't actually a mechanical keyboard; the keys on it sense the movement of your fingers by how they disrupt a "small electromagnetic field that is above the keyboard." This electromagnetic field also lets the entire keyboard double as a pointing and input device, so you can also use gestures to execute all sorts of common tasks like cutting and pasting.