Cited as a reference
Tracking fingers with the Wii Remote
Why people recommend it
Johnny Lee tracks fingertips with a Wii Remote's infrared camera and IR light, cited as a cheap way to sense finger position.
In their words
You can watch Johnny Lee's video demo 1 and video demo 2 of something similar to this; the demo is rather impressive given the minimalistic setup.
boardbite on electronics.stackexchange.com, Sept 2012. CC BY-SA.
You can see some previous ideas in hand tracking with the super colorful MIT glove, here's someone using the kinect, and here's tracking fingers with the wiimote.
Kit Scuzz on electronics.stackexchange.com, Nov 2012. CC BY-SA.