I have dreamed about it for years, a travel guide in a personal organizer … so that you can insert your own stuff into the guide and remove the unwanted information from the guide (e.g. why you need to bring the hotel information with you, if you already reserved hotel rooms in your travel destination ?).
I seriously think there is a big business around it, but now one publisher in Taiwan made my dream come true. Good luck to them !
Check out the Tokyo travel guide details here.