Slate has posted an excerpt from an entire book (?!?!) about pizza box design. It's short... and brilliant. As an amuse bouche, it does the job of highlighting several answers to vexing design questions that most customers probably never even considered in the first place.
For what it's worth, the epitome of the form is still "Twist-Ties vs. Plastic Clips: Tiny Titans Battle for the Bakery Aisle", by Paul Lukas (aka, Uni Watch dude). Go read it, because even if you don't think you care about how your bread bag is closed, you probably do.
This was the latest move in a business war that’s been under way for more than half a century now. It’s a battle fought by the makers of inconspicuous little products that cost a fraction of a penny to produce—the ones that everyone knows and nobody thinks about, but which represent more than an estimated $10 million in annual sales. Insiders describe the turf as the bakery bag closure and reclosure market; this is the battle of the plastic clip vs. the twist-tie.
(Image cc-licensed: "Pizza Pile-up" by Eric Kilby)