If you've ever thought making a peanut butter sandwich was just too much of a hassle, then I have the product for you: P.B. Slices. Here's a list of stores selling the slices in the USA. I also learned by exploring the P.B. Slices site that arachibutyrophobia is the fear of getting peanut butter stuck to the roof of your mouth. This site promises to cure the phobia in just 24 hours. Via Serious Eats.
*Previously: The best invention since peanut butter.