Yesterday evening I got a demo of a tool called Tegrity Notes.

It is basically a tool for recording video streams synchronous with slides, it was designed in the beginning for recording seminars in university and converting them to standard compatible broadcasts.

The notes components does the following:
You can write on paper while watching the broadcast or the live seminar with a special pen that records all yous notes you do on the paper and stores it inside the pen.
Afterwards you can save your personal notes in your portfolio and watch then when the video runs. and !! when you point to a part of your digitalized annotations it directly jumps to the timestamp in the video at which you have drawn this annotation. It really works very nice. I was quite impressed.

for basic product info see:
http://www.tegrity.com/notes.php