This came though a Facebook post by Vittorio Bertocci and it’s fascinating! it’s a form of typing without having to click or type anything using just one finger. You navigate through “books” of letters in sequence allow you to write a sentence by navigating through letters. checkout the video here :

 

 

Read up the whole project here : http://www.dasher.org.uk

they’ve also built a Windows Mobile / CE version that you can play around with here : http://www.dasher.org.uk/Download.html

It works amazingly well. you should give it a go. here are two screenshots from my Touch HD :

Screen01 Screen02