TREO 600
Can you download software/applications which will let you write text on the screen and have it translated into text?
etc. etc.
Any other way other than the qwerty to type?
as for on screen writeing, check out the software at Palm.com, if they have there and it will work on Palm os 5, it should work on this.
Also, if you haven't already, shoot the question to the Treo/palmone forums.