I.R.I.S.’ new digital pen looks promising. Writes on regular paper, transmits to a small bluetooth receiver with flash memory and USB port for later connection to your computer, captures data on the screen (when connected) in what looks to be real-time. AND it has Mac drivers! W00t!
I can’t wait for one of my early-adopter friends to buy one of these, and tell me if it works! (Dr. Kai, I’m looking at you!)