http://www.thing-a-day.com/2008/02/03/day-02-vibrating-bot/ -- Check out this one if nothing else

http://www.thing-a-day.com/2008/02/04/day-03-cat-toy/

http://www.thing-a-day.com/2008/02/06/day-05-obsessive-compulsion/

http://www.thing-a-day.com/2008/02/07/day-06-imu-test-harness/

http://www.rsnsoft.com/~machack/ThingADay7/ (Java applet)

http://www.rsnsoft.com/~machack/ThingADay8/ (Java applet)