Perhaps the touchscreen will suffice as the only input device for CarPC applications. However, I doubt this. What would be the killer text input device would be a battery-powered, lighted, RIM-style, bluetooth-enabled micro keyboard like the vaporware pictured on the right, but I have not been able to find one of these. Check out the MP3Car.com’s forums on input devices. Here’s my lame list of keyboard candidates.

1. LITE-ON SK7551 — It’s cheap at NewEgg, it’s got a built-in pointing device (one of those rubber nubbers), but it’s IR, is not especially small and has no backlight. I have older model that I have used with my home music system, and it works pretty well. Heck, this is what I’ll probably install since you can’t go wrong for $20.
2. Stowaway Bluetooth Portable Keyboard — Made by ThinkOutside. Hella expensive ($150), no light,  PDA/phone mount that would just get in the way.
3. Zippy EL-610 — Linked to J&R’s product page. Relatively cheap, but wired. Here’s a review.