DD, you should write an app for iPhone or WebOS or Android that would allow for inking with the finger (in all your spare time right :) I know there are several crude drawing applications out there that will allow you to draw on the devices. I don't know how good they are though. I am a Palm Pre user and just use it as a phone/PDA. I do have flash cards on it too and want to sync my Ink Flash cards but haven't been successful yet.
Current: TX2525nr, iPad (yes, even the iPad).
Former: Motion Computing LE1700, 1400 and 1300, TC1100, P1510