This is one of the more interesting ideas I've seen in a while; a simple docking station for internal hard drives that connects to the USB. Instead of tossing out older, smaller drives, just use them for simple storage by swapping them in a dock. I wonder if you could boot from one? That could be a good thing, since you could have one drive with Windows, one with Linux, etc, and just swap them. It definitely bears some looking into to see how well it works, and how reliable it is.
Hat tip to Everything USB