At 13mm thin, the XD3 Slim by LG ($95-$135) packs a number of cool factors for a user who needs a large amount of data on the go.  This series of portable external drive includes a dual interface connection (USB and SATA) and a storage capacity of 320GB or 500GB. It comes in a durable, aluminum case available in a variety of stylish, metallic colors, equipped with rubber-padded sides for impact protection.