There is a product called "LiveScribe" which is a pen for handwritten notes that also records the audio. It uses a special "GPS" paper with a location pattern i

There is a product called "LiveScribe" which is a pen for handwritten notes that also records the audio. It uses a special "GPS" paper with a location pattern in it and you can tap your note and it seeks back to the relevant audio. I think it also digitises the actual notes but I am not 100% on the exacts of that. Interesting in any case.