Brainport

Here's a nifty little device that sits on your tongue and electrically stimulates it via 144 microelectrodes. Your brain figures out how to "see" patterns on the surface of this device, and:

In testing, blind people found doorways, noticed people walking in front of them and caught balls. A version of the device, expected to be commercially marketed soon, has restored balance to those whose vestibular systems in the inner ear were destroyed by antibiotics.