Single-handed, Offline, Portable Data Input?

One Armed Bandit asks: "By now everyone knows the available single handed keyboard alternatives. What I've not seen available is a true portable one-handed offline input device. Gary Friedman's final concept for the DataEgg is a fantastic one. Unfortunately, it never made it to the market. I - for one - would pay a premium for this kind of device. I think one of the reasons that this hasn't been built is because of the requirement for users to learn a new input mechanism. In my experience, this is a more difficult perception to overcome than a skill to acquire. How many of you can navigate your various electronic devices by touch? Is anything on the market? Does anyone have a pet project?"

"The high points would be:

• Single handed operation (probably chorded)
• Local file storage
• On-board display for visual feedback and document review
• Uplink to host (USB, IR, Wireless)

I can't count the occasions which I'm walking down a noisy street (hence no voice recognition) and dying to jot down my stream of consciousness (without using two hands for a stylus and walking in front of a bus)? I would kill for something like this!"