Johnny Lee published an amazingly cool hack of the Wiimote enabling tracking of your fingers.

You might have already seen his Youtube video demonstrating the tracking fingers Wii hack as it already has over 750,000 views.

The Wiimote hack uses the iR camera inside the Wiimote to track your fingers and control cursors on the screen.

The setup uses the Bluetooth interface of the Wiimote to connect it to a PC. Multiple fingers can be tracked making this low-cost hack a very good implementation of the famous Minority Report user interface.
See the video here (Thanks Chris W.).