I'm the kind of person for who something like this could be useful.
I rarely leave the house without my Kindle slipped into the outside pocket of my bag, so it's within easy reach when I'm on the subway or waiting to cross the street. I also really enjoy browsing bookstores, but since I exclusively only read e-books these days, I never actually buy anything there.
If I could buy or add a book to my wishlist by just swiping the Kindle across the cover of a book in a bookstore, I can easily see that happening several times on each bookstore visit. Especially the wishlist part.
As it is, I tend to make a lot of mental notes about books that interest me, and then often forget half of them by the time I get home. Or I do remember them, but away from the allure of the bookstore I convince myself not to make a purchase.
I'm sure with this system I'd end up buying more books, which perhaps is not so good for my pocketbook, but good for the bookstore.
