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Old desktop favorite: Kensington 2-button serial big-ball trackball (Expert Mouse) with gel pads all around.--please don't die, the 4-button was noisy and cheap-feeling and was returned.
New couch favorite: Logitech Cordless Optical Trackman.--very smooth on the desk and the couch but shaped for rightys, and I like to switch when one hand tires. However, it's not too bad using the left hand.