Christmas-cookie bakers beware: not all packages of baking chocolate contain the same weight of chocolate. Both Hershey's Baking Bar and Baker's Baking Chocolate Squares contain eight squares of chocolate, but the Hershey's squares weigh a half-ounce each and the Baker's squares weigh a full ounce -- double the amount of chocolate! The packages look very much the same, but the Baker's one is thicker, kind of like a Droid compared to an iPhone.
As you probably know, I do a lot of baking, but I just learned about this difference a few days ago, and by direct pantry experience.
It's easy to say that consumers should just read the label, but that's tough to do in the jammed baking-supplies aisle when you have a list of errands to get through.