PS:
The Asus DR-900 seems to have the scribble in text feature. I just found out surfing without even knowing about this e-reader.
Hmm. it's not perfect yet:
http://www.youtube.com/watch?v=xqyNq36hlJQ
Just a bit more of that ol' patience.
Oops! What about this one? The Samsung 9.7 e-Ink reader:
http://www.youtube.com/watch?v=G_lCdace0tw