True story: When I'm out shopping, before I make an impulse buy, I compulsively check what Product X goes for on Amazon. I know, I know, there are barcode scanning apps that I could use to price-compare. But Amazon's consistently as or less expensive than just about anywhere, and more importantly, I trust them as a vendor.
All of which is to say that being able to scan barcodes from the Amazon app is going to save me all kinds of time that I'd otherwise be typing in product names with. Win. [iTunes]