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This is a new invention from Autodesk that will let any surface become a touchpad. It is called the Magic Finger and is a small device that attaches to the end of your finger. It works by using a tiny camera and optical flow sensor to identify surfaces and detect motion from the user. What is cool about this is that your finger can become your own mouse for your computer or anything else. You could also take a picture of where you are and then it will connect to your tablet and locate a map. Or in meetings you can conduct a presentation on any surface. Check out the link if you want to see more about this upcoming product!
Image Source: http://www.geeky-gadgets.com/autodesk-magic-finger-transforms-any-surface-into-a-touch-pad-video-17-10-2012/