I was way too cheap to buy an LCD to control my CarPC, so I wrote this to bridge the gap. Basically if you have mplayer and flite or festival (flite works better) and a keyboard you can control the PC using only a keypad and no screen. As you pick the plugin to use and move the keys the speech synthesis software will speak to you where you're going and what you can do.
Of course it's plugin-based and there's only 1 plugin at the moment (for playing MP3's) but if you just need something quick and easy this will work. Just set up Linux to make the first terminal the path to this program and configure the path to the audio or video files.
The end result is you can get a cheap USB or PS2 number pad and mount that somewhere in your car and browse your MP3's without ever taking your eyes off the road. This will also work in laptops for example, so no more dangerous side-glances at the laptop to pick an MP3 or change a window.
If you find it useful but want plugins made to control other things just let me know and i'll see if it's not too difficult to do. With some additional script I have you can auto-mount CDROMs and SCSI mass-storage devices and access it all through CAUI. Maybe I should write up a small tutorial...