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I built TrackBot a test platform for various technologies. It's easy to add sensors and servos. I'm using it to prototype the desgin of B4, a BeagleBoard based 'bot. So as soon as it is 'finished' it will get recycled, with a Beagleboard as its brain.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/trackbot-1