Or you can use a laptop with touch screen and/or a digital pen... And Google and microsoft have note taking apps that makes your hand writing searchable. Edit: wow, some people on HN really dislike touchscreens...
I have those as well but they're used for different purposes.
I don't see the point of adding a sticker to your laptop when it already can be used as a whiteboard with the added benefits of digitalisation (backup, share, undo, search...)