Motion sensors and anti-shake devices (for use with GPS etc.):

NB: Wikipedia and others mix-up

• sensors which determine whether the sensor itself is moving
• sensors which detect motion outside the sensor.
  

http://en.wikipedia.org/wiki/Sudden_Motion_Sensor

http://www.phototakers.com/forum/archive/new-antishake-chip-49320.htm

http://www.burnyourbonus.info/rec.photo.digital/thread3794.html