Sanwa Supply's "TRACKBAR Emotion" is a USB computer input aid that sits in front of your computer keyboard. The unit puts thick palmrests under your hands and numerous controls - left and right click buttons, browser forward/back buttons, a scroll wheel, and a four-way, double-clickable "pointer control bar" - between your hands. Sanwa claims advanced ergonomic design to make computing faster and more comfortable, without the need to shift a hand to a mouse. For Mac and PC. JPY14,980.
http://direct.sanwa.co.jp/ItemPage/400-MA009