If you're looking for an odd, yet usable storage solution, perhaps ACARD's Mirror Smart Mini is the thing for you. The device uses two 2.5-inch SATA drives side by side in a small enclosure; the drives can be mapped as a hardware-based RAID 1 array, or can be used as separate devices. The aluminum casing plugs into your system using USB 2.0, but unfortunately requires an AC adapter for power, thus making it slightly less awesome than we want it to be. Regardless, if you're moving around a lot and need a backup option, you might have found your $69 answer.
[Via Everything USB