This is the quintessential high-tech stocking stuffer. It's cute, it's small, and it'll remind the recipient of your thoughtfulness all year long. Unlike most stocking stuffers, this 4GB Building Block USB Drive ($34.99) is also useful [source: Perpetual Kid]. One half-inch-square plastic block holds the memory stick, while the other acts as a cap. The whole thing is attached to a key chain, so it will always be with the geek in your life and it will be harder to misplace, since the whole memory stick is only an adorable inch long.