Z1 is a simple, intuitive system for very rapid text input on a soft "qwerty" keyboard. The user simply traces a quick "connect-the-dots" path, roughly aiming to pass through each letter of a word.
The page after the first link has the videos.
The way I see it, this really is the replacement for 26-key keyboards on cell phones. Z1 comes from the same brains that made the T9 system for text messages. If handwriting recognition never becomes good enough, this will suffice and be faster anyway.
Now what I really want is these lengthwise-slider phones or a clamshell like the Nokia 9500 to get dual touch screens so I can properly surf the net or write stuff. The iPhone's screen is 480x320. What's really useful is 480x640.
How long before a reverse-clamshell phone comes out? Put two screens on the outside, rather than in. Then it folds out on a hinge for double the screen real-estate. If Apple thinks they can make one screen scratch resistant enough, then someone needs to do that to both screens.
1. Can check the time without having the flip the phone over.
2. Can use the camera for video conferencing or seeing what it sees when pointing it away from the user.
3. Hinged design means more space for the screen than on a slider.