The web site details start...
Keith McMillen Instruments introduces a complete series of bows for violin, viola, cello and bass. The bows capture gestures from real-time performance, and transmit the data to your computer where it can be used to process sound, control an electronic composition, manipulate video, or do anything else you can imagine.
The movement and acceleration parameters could be achieved with a wii controller at a possibly much cheaper price (don't know how much the K-Bow is) but the inclusion of distance, pressure and tension measuring parameters sets it apart.
Now all it needs is to somehow apply these type of controllers to a midi guitar! I suppose I could always bow the guitar
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