Just scoped out these tips for fast text imput w/o a keyboard from last weeks Economist:

Quikwriting: http://mrl.nyu.edu/~perlin/demos/quikwriting.html

Fast stylus based input. Owned by MS.

ShapeWriter. Claims speeds of 80 WPM using a stylus. Also reported to be accurate and tolerant of human irregularities.
http://www.alphaworks.ibm.com/tech/shapewriter

Lets get some emails sent to these people, esp. to Shumin Khai at ShapeWriter. The 770 needs this app!