As a teenager I built a Car PC for my Toyota Corolla (I was pretty cool, I know). I added 3 control mechanisms: 1. Video touch-screen 2. Mini numeric keypa

As a teenager I built a Car PC for my Toyota Corolla (I was pretty cool, I know). I added 3 control mechanisms: 1. Video touch-screen 2. Mini numeric keypad 3. Audible User Interface The touchscreen allowed me to navigate through my custom menu system by touching the screen. The numeric keypad worked as "arrow keys" as well as allowing numbered inputs. The Audible User Interface gave me voice feedback of any selection I made, and would ask me to make a selection; I could make my selection by voice feedback, the numpad, or the video screen. Voice feedback was iffy and the touchscreen was distracting and finicky. What ended up sticking was the numpad and audio feedback. I could navigate every single aspect of my UI without ever taking my eyes off the road. I would hit a "Menu" button, and the car would say "Main menu." I would hit the down-arrow and it would say "Music." Another down-arrow and it would say "Settings". Hit the Enter key and it would say "Settings menu." And on and on... Any selection could be made by scrolling through a menu or typing a number, and I could hear where I was in the menu. To impress people at car shows (well, to impress girls) I mapped an RF remote control to the numpad. I'd stand outside the car and hide the remote behind my back and talk to the car, then hit the right button on the remote, and the car would talk back, like Kitt. People loved it :) mostly guys though :( That was 18 years ago. I don't know of a single device that provides an Audible User Interface today, but it's still my favorite.