I'm keeping an eye (just one; it's easy if you have independently movable eyeballs) on PixelQi - they're releasing a nice-size screen with a decent resolution:
http://www.pixelqi.com/blog1/ Now, we need someone to en-tablet this with a digitizer or something, which NotionInk failed to do. Maybe by the time my edge breaks? (I can live with one screen if it does both things; people can always buy 2 tablets if they need 2 screens.)