Palm Pilot Robots

Has anyone purchased this kit or tried to design their own Palm robot? See:http://www.oreillynet.com/pub/a/wireless/2001/02/23/palm_robot.html
What are your thoughts? I have 2 old Palm Pilots that I'm itching to put to use in a bot. I like the idea of using the pen to draw a course for it to follow.
-- Shawn
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