This week something beyond TECHNIC again. But... I got amazed when saw that at nxtasy.org and had to post it here either. ;)
A robotic hand that mimics your own hand movements. 3 HiTechnic Gyro sensors are attached to your hand at specific points and measure the movements angular velocity.
Continuous integration of readings allows to determine absolute position angles, so the NXT motors rotation angles could be set the same way.
Author left us the code here. :)
This work was preceded by a simpler version with one single sensor, that is able to reproduce your fingers movement.