By now, you're likely familiar with Twelve South, the Mac-minded accessory maker that prides itself on staying small. Well, three years after the debut of its first product, the BackPack, it's refining the shelf accessory in three ways that'll make you smile. If you'll remember, the BackPack originally began its life as an attachable storage shelf for the iMac and Apple Display, which sat discretely behind the unit. Now, not only c
