It's almost what I want. http://www.livescribe.com/
You can write notes and then upload to the computer. And you can record, and it will play back what was recorded at the time you wrote the notes you tap.
But really, the thing I want is a computer pen that will take my handwritten notes and type them. So I can interview someone, write handwritten messy notes, and foom! upload them and suddenly they are neatly typed. I think you may be able to do this for an additional $29.95 software from Vision Objects.