Prior Storage Pod designs have been built into many build-it-yourself storage systems and some commercial OEMs have also picked up on the design.

FORBES: Open Source Storage Changes Industry Cost Structure

The second-biggest form of bulk-energy storage, though it is dwarfed by PSH, is compressed-air energy storage (CAES).

ECONOMIST: Energy storage

It's not really designed for data storage -- instead, it's meant to be used as a certified Windows To Go fixed drive, "a fully manageable corporate Windows 8 workspace on a specially configured, bootable USB drive".

ENGADGET: Hands-on with Kingston's DataTraveler Workspace at IDF (video)