A geo-logger. Combine an openlog & gps (GPS-11571) w/ some button cells or small lipo into a strip that can be integrated into a dog/cat collar or a bracelet. It would be a lot of fun to find out where the cat goes all night. It would be convenient in a bracelet format when cycling or hiking to keep a record of your route. Include a 6DOF sensor and it could monitor your golf swing.
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